scoreboard players tag @a[tag=!Starting,x=500,y=110,z=474,rm=3] add NotFalling {FallDistance:0.0f}
scoreboard players set @a[tag=NotFalling] Falling 0
effect @a[tag=NotFalling] jump_boost 0
effect @a[score_Falling_min=9,tag=!Starting,x=500,y=110,z=474,rm=3] jump_boost 1 255 true
scoreboard players tag @a remove NotFalling