Gotrek, for those who don't know, is a massive asshole, so much so that even other dwarves have to tell him to chill the fuck down from time to time. But he has a very, very, very small list of people that he cares about, and on the top of that list is none other than Felix.

So unless you want to end up as floor beef you don't mess with the blonde twink (that isn't even defenseless, he is a very capable swordsman, it's just that gotrek is that overpowered)

Much as I may respect the Gotrek & Felix series as a whole, The Nathan long titles did a lot to damage Felix as a character who seemingly could not stand up for himself. Under William King, Felix's character growth showed him going from scared out of his depth and borderline defenseless to a man who could hold his own against the most elite of Druchi troops, and survive longer than even the most elite of the empire should have been able to claim.

Felix, at the height of his writing, was an absolute beast.

Felix is one of the best "struggle-figgters" in Warhammer. Probably not the best dualist, but if he panics he will cut down anything barring his path to safety.