(adsbygoogle = window.adsbygoogle || []).push({}); Hey guys I found a new tutorial on youtube. It's on how to get free perks.
Credits to Caspahz for making this video.

What if you miss a knife attempt? Would the perk powerup still drop?

If you try the knifing only method, yes, it will still drop. As long as NO ONE shoots a SINGLE bullet, the perk will still drop.