|Details||Improves the effectiveness of the Interrupt Attacks.|
The Sure Strike perk increases the damage for all stun attacks, but more importantly, causes even the first Interrupt Attack (the backhand punch with the left hand) to cause a heavy stun on the victim; the target will stagger backward rather than just a short flinch.
There are two levels of severity that a player can be stunned by: light and heavy. A light stun causes a Marine to appear as though he is flinching. A heavy stun lasts longer, and the Marine visibly staggers.