Let the slimes defeat you in your first Thrane encounter before you meet Nauxus in the forest, you will not be able to enter the Bull Village and will be forced to follow the lizard tribe route, and if you work together with Selye you can unlock the scene letting him defeat you before the emblems fly away and if you win and save him, he will join you at the tavern.
This is the only way at the moment.
P.s. my english sucks sorry
P.S.S. the fight with Alex will be very hard, but with Seyle regen spell shoul be a lit bit easier.