First off, that example would not be a few seconds. We’re talking about at least a couple minutes there.
Second, I guess I dont really care about the specifics of filmmaking. All I care about is having the characters and lore make sense. If there is a small sacrifice in the former department for the latter to work well, then so be it I say.
I would argue the tension is released when the stormtrooper is killed. Who the guy is after that shouldn’t keep the audience concerned.