Basically the Indominus is part raptor so it communicates with them and turns them against Starlord.
Later on when they're about to attack him he stares in their eyes and with his power of faggotry they remember that they like him and turn on Indominus.
They're geting wrecked and the autistic kid says "We need more teeth" (Not even kidding, he's a fucking tard). So the ginger bitch goes and let's the trex out to help.
They all fight, all but one raptor gets killed, the trex throws Indominus near the water, the big fish monster jumps up and drags in under water.
Trex and the last raptor look and each other and give each other "Respecting nods" then wander off.