Skool Daze: Routine at F533

So ERIC has jumped while standing on a boy. Now either A=0x00, meaning it's time to set the jumping action timer at 7FF6 back to 7, so we can deal with ERIC while he's standing on a boy; or A=0x01-0x0F (but not 0x06, because that would lead us into the code at F563 to perform a redundant check on whether ERIC is standing on a boy), meaning we need to run the usual checks while ERIC is in mid-air.

Used by the routine at 6AD9 when bit 2 of ERIC's status flags at 7FFB is set (by the routine at F46E, via F499).
F533	LD HL,$7FF6	Decrement the jumping action timer at 7FF6 (which starts at 0x10)
F536	DEC (HL)	Has ERIC completed the jump?
F537	JP Z,$F425	Jump if so
F53A	LD A,(HL)	Pick up the current value of the action timer in A
F53B	CP $0C
F53D	LD B,$0F	Lines reprimand 0x0F: YOU ARE NOT A KANGAROO
F53F	JP Z,$F456	Jump if it's time to check whether any teachers can see ERIC jumping
F542	LD H,$AC	0xAC=ERIC
F544	CP $0D	Is it time to check whether ERIC has touched a shield or opened the safe?
F546	JP Z,$F51E	Jump if so
F549	CP $0E	Is it time to make the jumping sound effect?
F54B	JP Z,$EAEB	Jump if so
F54E	CP $09	Is it time to move ERIC's arm back?
F550	JP Z,$706B	Jump if so
F553	CP $03	Is it time to bring ERIC back down to the floor?
F555	JR NZ,$F55E	Jump if not
F557	CALL $6214	Update the SRB for ERIC's current location
F55A	INC D	Move ERIC downwards
F55B	JP $61B0	Update ERIC's location and update the SRB
F55E	CP $06	Return if A < 0x06 (nothing to check or do)
F560	RET C	Return if A < 0x06 (nothing to check or do)
At this point A=0x06 (which means it's time to check whether ERIC has jumped onto a boy, or ERIC is already standing on a boy), or A is one of {0x07, 0x08, 0x0A, 0x0B, 0x0F}, or A>0x80 (which means ERIC has jumped while standing on a boy).
F561	JR NZ,$F5AB	Jump unless (a) it's time to check whether ERIC has jumped on a boy, or (b) ERIC is already standing on a boy
This entry point is erroneously used by the routine at EAEB with H=0x03 (which means (D,E) is set to (198,32) by the code that follows, and the routine exits at F579).
F563	LD L,$61	Byte 0x61 of ERIC's buffer holds his y-coordinate
F565	LD D,(HL)	Pick this up in D
F566	INC D	Down a level (where the boy that ERIC is standing on would be, if any)
F567	INC L	Byte 0x62 holds ERIC's x-coordinate
F568	LD E,(HL)	Pick this up in E
F569	LD B,$0B	There are 11 little boys
F56B	LD H,$98	0x98=little boy no. 1
F56D	CALL $F5B9	Is ERIC standing on a little boy?
F570	JR C,$F57A	Jump if so
F572	LD H,$A7	0xA7=BOY WANDER
F574	LD B,$03	There are three main kids besides ERIC
F576	CALL $F5BF	Is ERIC standing on one of the three main kids?
F579	RET NC	Return if not
ERIC is standing on a kid who's been knocked out.
F57A	CALL $673A	Check for keypresses
F57D	LD HL,$7FF6	Set the jumping action timer at 7FF6 to 0x07, so that we keep returning to this section of code while ERIC is standing on a boy
F580	LD (HL),$07
F582	RET Z	Return if no key of interest was pressed
F583	SET 5,A	Convert the ASCII code of the keypress in A to lower case
F585	CP $6A	Was 'j' (jump) pressed?
F587	JR NZ,$F58C	Jump if not
F589	LD (HL),$90	Set the jumping action timer at 7FF6 to 0x90 to indicate that ERIC has jumped while standing on a boy
F58B	RET	Return to the main loop with the carry flag reset
A key other than 'j' was pressed while ERIC was standing on a boy.
F58C	CP $6F	0x6F='o'
F58E	LD B,$00	Set B=0x00 (ERIC facing left) for later comparison
F590	JR Z,$F597	Jump if 'o' (left) was pressed
F592	LD B,$80	Set B=0x80 (ERIC facing right) for later comparison
F594	CP $70	Was 'p' (right) pressed?
F596	RET NZ	Return if not
F597	LD HL,$AC66	A=animatory state of ERIC before he jumped (stored in byte 0x66 of his buffer)
F59A	LD A,(HL)
F59B	AND $80	Keep only the 'direction' bit
F59D	CP B	Should ERIC turn round?
F59E	RET Z	Return if not
F59F	LD A,(HL)	Adjust ERIC's pre-jump animatory state to reflect his turning round while standing on a boy
F5A0	XOR $80
F5A2	LD (HL),A
F5A3	CALL $6214	Update the SRB for ERIC's current animatory state
F5A6	XOR $80	A=animatory state of ERIC facing the other way
F5A8	JP $61B0	Update ERIC's animatory state and update the SRB
At this point A is one of {0x07, 0x08, 0x0A, 0x0B, 0x0F} (which means there is nothing to do), or A=0x80-0x8F (which means ERIC has jumped while standing on a boy).
F5AB	CP $86	Return now if the SUB $80 instruction below would make A=0x06
F5AD	RET Z
F5AE	SUB $80	Return unless ERIC jumped while standing on a boy
F5B0	RET C	Return unless ERIC jumped while standing on a boy
So ERIC has jumped while standing on a boy. Now either A=0x00, meaning it's time to set the jumping action timer at 7FF6 back to 7, so we can deal with ERIC while he's standing on a boy; or A=0x01-0x0F (but not 0x06, because that would lead us into the code at F563 to perform a redundant check on whether ERIC is standing on a boy), meaning we need to run the usual checks while ERIC is in mid-air.
F5B1	JP NZ,$F53B	Run the usual checks while ERIC is in mid-air above a supine boy
F5B4	JR $F57C	This should be JR F57D