OK let me simplify for you... To call someone retarded for trying to be helpful, is a dick move, which wasn't even worth replying for if you didn't like it or already knew of it, just a childish comment... Maybe his experiences in Destiny of Titans/Hunters/Warlocks jumping everywhere and getting wasted instead of using this mechanic (which doesn't stop them flanking you and trying to melee your skull into the ground)... It has led him to believe no one knew? Put it this way, if I seen attitude like that in person, I'd put you on the ground and let this guy kick you in the balls ;)