I'm sorry that I have to reply with this screen shot (maybe NSFW) Hmmm...
I'll see you that screenshot and raise you one from before we had to stop doing this *and no it's not my character, I saw this upon entering the Atlas Park hospital one day and had to take a screenie...*
Please read my FEAR/Portal/HalfLife Fan Fiction!
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A Warrior's Friend: ID 335212 - Help Infernal save Valkyrie from Battle Maiden.
Above Mars Part 1: The Wellington: ID 159769 - Save Mars by destroying a monstrous battleship from the inside!
>.> My DA page, where I attempt to art.
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Yup. Collision cylinders for the win. 
Please read my FEAR/Portal/HalfLife Fan Fiction!
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I had to post this.