Really hard to say with Secret Service where and what they are carrying. Likely a handgun strong side carry on the waist but also perhaps a PDW like an MP5 or e

Really hard to say with Secret Service where and what they are carrying. Likely a handgun strong side carry on the waist but also perhaps a PDW like an MP5 or equivalent in its most concealable iteration under the arm on the weak side. The hand position is pretty standard as a ready position for many fighting systems. Easy to go to a guard position or to initiate striking or pain compliance maneuvers from that stance. On a startle cue, from that position the hands will come up, at which point they can choose the appropriate response.