As Robin recovered from the intense pain in his stomach, Wesley tried to gather his strength, and Philip struggled to get up from the ground after the impact, Klaus looked down at them with great disdain. They were the rabble of society, and he was obviously uncomfortable getting his hands dirty with them.
The bullies were clearly shaken, but they didn't give up easily. Driven by a mixture of anger and wounded pride, they stood up again and again, trying to overpower Klaus with their brute strength.