Chandra doesn't answer immediately, because he's still looking at Sylar. There's only so much detail you can make out when you're running from a distance, but it's obvious that some kind of disagreement went on here. And Chandra wouldn't be terribly surprised to find out that Sylar was to blame. Apt that he wants a different name, because it can't be Gabriel who did those things. Not the Gabriel Chandra knew.

He looks rather like he wants to kick him.

Chandra does look up at Darla after a few seconds, though. "...You think this is a different planet?"

Okay, so there were triffids. But this is a man who makes it his business to deal with gods and monsters on a daily basis.