I tried this twice in a row just to see if it could be reproduced. If a Flaxbeard exosuit is equipped with a Power Fist in the arm slot of the chest piece and a player swings bare handed at an enemy, the enemy is supposed to be knocked back but instead all that happens is that the player's client crashes. There's a link to the crash report below, hope it helps. Edit: Could a mod at least reply so I know this has been seen by one? Last time I posted about a bug it was fixed but the thread was never replied to or closed so I pretty much had to constantly check that recipe in game to see if it worked. http://pastebin.com/NG2mSN3X