Sig heard the words the man with the fedora said, but wasn't too worried, since he was just a man anyways, or was he?
In any case, no one can tell Sig what to do. No one. His confusion turned back into anger and Spike straightened his back even more to seem bigger.

"I'm not your buddy and I can stay wherever I want!"
With that Spike fell to all fours, roaring at Will and shaking the ground. This man here clearly doesn't know who he decided to start a fight with, Sig decided its time to show him.

He raised his arms suddenly, creating a pillar right under his feet, which lifted him up in the air. If the man had any common sense, he'd have started running and not have looked back.
Sig grinner triumphantly, loving the feeling of being more powerful than the race he hated.