The water was probably to signal to sleepers to be on standby, and the switch to coke with someones name on it was the trigger for that specific sleeper.
Good work anon, many pieces fit together with that theory.
he grabs him by the other shoulder too, I think he was trying to pull him down out of the way.
If he is involved in the attack he wouldn't want to be near an explosion that would kill Maduro.