For about 4 seconds, Starscream gets to stand there and look smugly pleased with himself, feeling superior.... until then he's tackled by a raging ball of angry troll and promptly lets out the most undignified sounding squawk imaginable.

Flat on his back and yowling angrily, he immediately begins to claw and kick at any part of Karkat he can reach; holo-matter combat is not exactly a highly skilled form of combat, and while the punching and scratching can't really physically hurt him, the feedback he gets each time a blow makes contact is starting to give him a hefty processor ache, and he absolutely cannot BELIEVE the audacity this creature has to even think of laying a hand on him.