I think the heal event was did wrong, it should look something like this:


on damage:
damage cause is void:
teleport victim at location at (-474, 5, -307)
wait 5 ticks
execute console command "/effect give %victim% instant_health 1 20"
broadcast "&c%victim% &6was thrown into the void while holding &c%victim's held item%" ## not sure if that is a valid variable
broadcast "&c%victim%'s &4&litem &6was removed."
execute console command "/clear %victim% %victim's held item%"

If this doesen't work, it might need tweaking.