You used to be able to middle click with grenades, C4/IEDs and the AT mines as well as the knife to punch, which was handy in case you got caught in a pants-down situation, but now you're 100% screwed no matter what if someone walks in on you with a nade out. Fisting people in the face has saved me on multiple occasions so I'm curious as to why this was removed as maybe I haven't been looking hard enough, but I can't find any patch notes regarding this change.