Brilliant! To me you capture Curufin's intent so well, from casually so disinterested from just speaking those words that will hit home with Celegorm... This is very effectively drabbled: you pick a scene and give us for that brief moment the insight in their dynamics. It doesn't need more, you show us how Curufin was able to get under Celegorm's skin and instigate well... trouble. What a treat!

Curufin is as smooth as silk here--I love how you portrayed him.  I also sniggered at his awareness of Celegorm's healthy opinion of himself.  Wonder what Celegorm will do after having been humbled.