Melting a human

I'm doing research on an alien character from the Goosebumps book Secret Agent Grandma (What a title) and one of the feats of the alien is spitting acid onto 3 humans and they all melted.

The question is what tier would that be? if there is an answer to this it would be appreciated (I couldn't find anything about melting a human, the only thing I can find is that human flesh is capable of melting off).

Assumption that is probably wrong: Wall level

bump

Melting a human would definately be less than vaporizing a human; which is 9-A. But melting a human, I'm not sure if that was calculated. Would be in the 9-B to 9-A range for sure.

I do not think that it was ever calculated, but you can ask here if you wish:

https://vsbattles.com/vsbattles/3403260