In early versions of the last mission in F.E.A.R 2, Griffin was the final boss that you fought. Story changes dictated that Keeton would become the boss and his attacks would changed accordingly.
When Griffin was the planned boss, he was considered a "Super Remnant" (apologies... these terms only mean something if you have played the game) with a powerful scream attack that would cone out from his lips to seek and destroy the player. Below is the animation I did for his attack. I added a lot of speed and pause to give an eerie feel to his movment.
I performed the original motion capture on this, and if you want to see how much key-framed alteration I did on the final animation take a look at the render of the raw mo-cap data below.