Ethan has blood on his hands after finding Hannah and Golitsyn dead, then wipes them off in the phone box while talking to Kettridge. When he throws the chewing gum bomb at the fish tank his hands are clean but when he arrives at the hotel he proceeds to wash blood off them.
if you take a good enough look at this "washing his hands" scene, there would've been more blood there then what appears to have been there.
good call, never really noticed, but watch his hands when he going through the bags in the bathroom
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