I think at this point, the solution is to complete the trials(or help Amelia do it), so that they an ALL leave, put some distance between them and the rabbit, and more importantly, put up a concentrated assault to overwhelm the assassins.
The assassins keep winning so far, but against Ram, Frederika, Garfield, Amelia and Beako simultaneously, they should be able to handle it.
Hopefully, that would get him a new save point, so then he can focus on the rabbit.
I think his reasoning is, the longer he lives, the more he might learn to use to his advantage next time. Especially against opponents that might gloat once they're certain he's going to die.