Okay! In the scene where Rodney shoots at him, it looks like the last shot glances off the doorway. But a few minutes later, when Phoebus and Thalan are taunting each other on the radios, Thalan is adjusting a bandage-type-thing around his upper arm. It looks more like gauze tacked down with duct tape than a field dressing but I can't think of any other reason he'd have it on.