Harrison feels... kind of embarrassed? Kind of bad? It's hard to really sort out what negative feelings are going on right now, but it doesn't really matter and he's not really one to introspect, anyway. And he definitely isn't one to know what to say to Viola.
"Sure," he finally settles on, which isn't helpful at all.
Harrison & Viola... & Felicity
"Sure," he finally settles on, which isn't helpful at all.