They handcuffed the students so tightly. One kid, later on they were unable to cut off his ties, they’d been tied so tight. One of the other students couldn’t feel his hands they were so purple, his circulation was cut off so badly for so long. He took himself to the hospital after he was released from the zip-tie restraints. They told him he had nerve damage and not to expect to be able to feel his hands for the next week. He has to come back next week to see if there was permanent nerve damage in his wrists. 
…Aside from refusing the order to disperse, the only rule we were breaking was camping on campus. But since we had the first night waived by Chancellor Katehi, we really hadn’t even broken university policy, she waived the code.

From an interview with one of the non-violent protesters pepper sprayed at UC Davis.