Andrew and Matt fight each other throughout the city, and they cause some destruction to buildings and streets etc.
Andrew is constantly bullied by schoolmates, is constantly abused by his alcoholic father, and is disturbed by his cancerous mother. He is a depressed boy, and many of the violence stated comes from his depression.
Andrew is head-locked by a schoolmate, and is punched and slapped repeatedly.
Andrew uses his powers to rip apart a spider, and you see the detached limbs and abdomen, as he drops it on the floor. No gore, but some sound effects make it disturbing.
A teenage boy is attacked by a man; he uses his power to throw him up against a wall, and then across the room.
A teenage boy uses his powers to throw four teens around the street. We then see two of them lying face down with blood blood trails, presumably dead.
After being in an explosion, Andrew is seen with bandages all over his body. Over time, some of the bandages come lose and we can see exposed bloody skin for the rest of the movie.
A teenage boy is shot by a police officer. Blood is shown dripping from his fingers. He screams out in pain very loudly.
Because they are interconnected with telekinesis, Steve, Matt, and Andrew get a massive nosebleed when they 'overexert' themselves.