Yes, we can’t tell what he’s doing from a still photograph. He could be bent over laughing — it does look like someone’s just told a joke, judging from the expressions on others’ faces.
Truth is: He might not be “bowing” in reverence to anyone here. Let’s not be so quick to judge what’s going on.
True..he could be doing an episode of "Mythbusters." You know, the one that explains why you do not shake the right hand of someone in an Arab Country...