Harry put his glasses back on, grimacing as he noticed a crack and hoped that wouldn't effect their blocking powers. He didn't met the persons eyes, instead he looked down.

"I'm s-sorry! I didn't mean to run into you!" 

He wanted to keep running, wanted to be in his room where he didn't have any risk of meeting someone's eyes. He wanted to be able to control the powers he had, or at least make it so they didn't effect him so much.