The issue is one of scene economy. You'll notice in the outline that we condense Fingon's search itself to a series of shots in a montage that lasts several minutes. Adding an action scene would require a scene to set up the confrontation, a scene to have the confrontation, and a scene for him to question a prisoner. That is about 10-15 minutes of screen time, which we just don't have in this episode. Had we stretched the rescue into Episode 2, it might have been doable, but it just wasn't possible in the time we had.Maybe it works like this with having nobody for Fingon to find, because he has no one to question as to where Maedhros is? I admit that I'd be one of the last to leave out a fight scene (see post above about Rog's escape), but in this case it would work well.