As someone who still sucks at the game after playing for about a month I do kill my teammates on the occasion. I try to make it better with an apology but i decided to switch to short things like falchion or a mace. One day I hope i can perfect a two handed control so im not stopping in the middle of battle and saying "My Bad".
i still kill teammates accidentally from time to time, it happens but they're honest mistakes (1600 hours played)
if you wanna make an omelette sometimes u gotta crack a few teammates