They are using stamina , you can also , just push your slider all the way up , the elite and adrenal boost give you 10% then the stamina takes it all the way to 37%. But understand they are blowing thru their stamina to do this. a regular attack takes 1 stamina using the boost uses more, I never boost so not sure but Maybe 5 stam for each attack . But if you can beat someone with one stam and the other two boosts stamina that is your best bet.
Last edited: Jul 21, 2014