Tyr was against multiple Bishops and a few other soldiers, no one else knew he was there because they were too busy watching the walls.
However, Tyr had an option and that was to call for reinforcements because there was no way he could take on this many people alone.
Yet Tyr decided to descend the steps, the warriors welcomed this because they recognized him and knew that he was an important figure in the army.
"Don't underestimate him!" Wilfrid warned in his cell, that Tyr had anticipated that he had a plan.
There was no reason for him to engage in a fight he would lose, that didn't make sense in a war even if his emotions played a factor.
Tyr had kept an eye on the dungeon and noticed that there were strange movements, even he missed when they took out the guards, they were that fast but he could feel something was off.
And without even speaking to them, Tyr decapitated the guards based on that assumption alone.