I stay the hell away from the trapper as much as I possibly can. Be constantly aware of where the trapper is, that’s my one most important tip. If you’re tagged, just give up sneaking altogether and break line of sight to eat small portions as you run away from the hunters. No point in evolving if you’re tracked, so just keep running until it wears off, and then begin sneaking to find a safe spot.
No safe spot in sight? Go to the far end of the map, attract birds there, then proceed to sneak all the way across the maps while the hunters survey the area you just triggered in. Of course, that requires you to be totally unseen when you go back to the other end of the map… It’ll buy you enough time to evolve without getting damaged in the process. Then, repeat til stage 3. You can engage at stage 2 with full armour too, though! I suggest focusing medic first, then Hank if he’s there-- if not, go for assault. Bait out his shield and wait for him to be vulnerable. Support after this, and finally, trapper.
OF COURSE, if you want to get out of the arena ASAP, focus the trapper at all costs! But why waste an opportunity to inflict a strike or two on the medic if you can, hmm? By the time you inflicted those strikes on the medic, the arena is probably very close to going down-- your cue to bail.