It is common for lps like bubble frog spawn and hammer , even more so branching to flop around during transport or in to high flow and the calcerius points and ridges of the skleleton cuts and tears the flesh which usually does eventually die.
Some coral heal and repair well , but some lps just can't.
If this is the case it doesn't nesecerally mean you killed it , it may have happened during its trip from Fiji , most coral is injured after collection , were far more careful as hobbiest than divers they crack it off sack it up n toss stuff about I'm sure a great deal more than we would like to think.
Just give it some time , if it doesn't bounce back , be patient before long someone will have one needing thinning 2 heads turn to 20 in 18months
Good luck I wish you and the coral the best.