(Sorry in advance if this has been answered, I tried doing a search but didn't see anything quickly)

Why didn't Alexandria throw Leviathan, and maybe behemoth, into space? In the Cell Interlude 2, Lung sees Alexandria grab Leviathan by the tail and fly him so high up he can't see them, before dropping him. Is there a good reason she didn't just... keep flying him up?

I know that she has to breathe, but between her and Legend, (and maybe just holding her breath for like, a minute?) they should be able to get him on an outbound flight away from Earth B, into space. I can't think of any potential Leviathan powers that would let him stop/ turn around. Behemoth perhaps could use his vague energy powers to manipulate gravity or something, so maybe not so easy with him.

Hopefully I'm not asking a really dumb or common question, just something I'm thinking about.