Save this as jump.sk

if player's world is "Hub":
	on flight toggle:
		player's gamemode is not creative:
			cancel event
			wait a tick
			set player's flight state to false
			push player upwards at speed 0.3
			push player forwards at speed 0.8
			play "GHAST_FIREBALL" to player at volume 0.99
	on jump:
		player's gamemode is not creative:
			block below player is not air or water:
			set player's flight state to true