He isn't surprised by the friendly way he's approached there - Bruce isn't nearly so small-minded to find an incongruity between size and demeanor - but he wasn't really expecting it, all the same. His slowness to reciprocate doesn't read quite as hesitation, but more like it takes him a second to process and acknowledge what Seoraj just did as what it was.

When he does return the gesture, hands still a little bruised and grip firmer than one might expect from someone his size (...compared to Seoraj), he seems at ease, but no less guarded. A little curious. "Tom."

(It takes him a minute to pinpoint that it's the lack of mania in the other man's friendliness that's throwing him off.)