Added 5 minutes later
Also, this "torn to shreds, like a structure" probably indicates that both the structure and it were torn apart by something. In general, it's not bad, at least because the monster now has 35% health left, and it will take a long time to restore 15% of it. At least in this and probably the next nights, it will be inactive. It's a pity that there are no clues at all :(
And you are probably right because only a monster can destroy a trap, stay alive, and continue its ND.