I think we got pictures, but - I dunno. There were two people involved besides Lan Wangji, that much is obvious. And there's the trail, but no sign of exactly where things started that night, or if he even fought back.

[ frustrating! ]

If they used the weight as a bludgeon, they'd need some kind of leverage to reach his head, for one. And how did the rapier break, anyway? Those things are surprisingly sturdy, even if they are blunted.