Kay, what I'm planning is that Number helps Axel escape, only she's going to pretend she's only helping him for her own benefit (since she heard about Axel being in Deoxys' captivity for a short while, she can try to get information out of him). Number's going to explain that she won't risk allowing him to join her in reuniting with the army for obvious reasons. She'll try to get information from him and proceed to ditch him. Maybe she might tell him that they can work together behind everyone's back, but I'm not sure how to go about that yet.
Also, since Snype mentioned Axel stopping an Infected from dying, Number will get pissed and go all passive-aggressive on him - she's gonna make the rescue as slow as possible just to agitate Axel. Instead of trying to get Snype to leave or sleep, she'll keep a conversation going and act like nothing's wrong. XD sorry, I wrote you a novel here.
Number is (going to be) Axel's heroine \o/
So nice of her to help him out :3 And he's going to feel really indebted to her. Would she head off with the army again afterwards, or what? Would be nice to know what kind of plans you might've had in mind.