Tyr was exiled, and he had just slaughtered Erik like the dog he was but he lacked the experience to survive on his own. He wandered, he had an invitation from King Rugalf but Tyr knew he was not ready for that lifestyle right now.
He was a warrior and he needed to tame his animalistic side, he knew he loved killing and understood that he was closer to Erik than he was to anyone else.
But he had no intentions of becoming like Erik, Tyr knew winter was near and the chances of his survival were low.
Tyr used an inhumane tactic to gather food while the sun still shone, he injured animals just enough to immobilize them so they don't rot, leaving them alive but in a crippled state.