Salem Center was where the Starbucks Matt worked at was located. In fact, he'd been working there since around 9 this morning and was just getting off work. Ah, the few simple hours he had before heading to his second job.
He wished he'd be able to enjoy it more, but as Matt walked with a fresh brewed coffee in hand, he could only think about Kait, and what had happened while they were out shopping. Her home had been attacked, and he'd kept her out. Sure, she was safe, didn't get hurt, didn't hurt anybody... but he felt a little guilty. He wasn't even sure why.
So it was because he was lost in his thoughts that caused Matt to turn corner, avoid hitting someone else, and run straight into the boy with the green hair. Green hair wasn't that abnormal, not in New York. But what was abnormal, was the fact that when the hot coffee went everywhere and Matt realized he was running into someone, he immediately put up his power negation - which caused the green haired boys hair to turn... brownish (blondish? unremarkable).
He quickly dropped the power negation, which turned Lorne's hair green again.