Meh, a similar spell should be possible to derive from the wand that doesn't require that tribe's blood. It'd take a while, but Ho Jae can definitely escape the middle floors just by wandering around upwards. It's not like he's going to starve to death when he can just buy food from the system or eat his infinite stores of beef jerky.
I thought the kid would make a better plan than just the threat of Ho Jae getting lost in the labyrinth without him, though.