Talk:SAS: Zombie Assault 4 Skills/@comment-93.86.242.80-20150104143311/@comment-24659969-20150104164111

7 energy regen = 1.75 ep/sec + 2.5 x 2 from revitalising, you only have 6.75 energy regen.

If you want to get to the point of infinite knife, you need at least lv 19 energy regen, 2x revitalising 10 and the helmet mastery. +1 base energy regen to support other skills

At maxed level, knife only have dps of somewhere 4.5k including animation cooldown, basically the knife dps is somewhere 1.2 to 1.5 of the displayed damage. Which can only achieved at level 26. At such level, your gun would usually have more dps than that. So unless you have slow reload time with your guns, maxing out knife is not that recommended. Take some enuf to insta kill apex stalkers, shielders or apex runner is good though.