Talk:Critical Hit (Mechanic)/@comment-61.4.16.205-20130919173105/@comment-13342856-20130922061026

" Invisibility and Smokescreen provide melee damage amplifiers, but do not guarantee that each hit will be critical. Actual crits will be indicated by red rather than yellow numbers"

^ Straight from the page you're already on... No one is sure what exactly gives random red crits outside of this, or if they even do the damage it displays as red when it happens.