User blog comment:VJF&RMF/Doomguy Vs. Hayate Ayasaki/@comment-379205-20130122022618/@comment-5872914-20130122045359

You should also note that Hayate has taken down an EVA-sized robot, which is something that the doomguy can't easily take down even with hisBFG, and he has eventually mastered it, as he appears to be fine after using it to defeat Yukiji in chapter 70. This suggests that his body can now withstand the strain of the technique, or that he can adjust the intensity of the technique, or both. Also to mention is that he can easily dodge ballistic weaponry (and the BFG 9000 has a slow velocity compared to a regular ballistic firearm).