ToME: the Tales of Maj'Eyal

Actually it sends up to X projectiles away, up to Y per enemy. BUT it uses default paths for projectile travel, which differ from targetting cone. That allows to target fan in a tricky way that sends all projectiles to one enemy (it sees multiple enemies and can target them, but projectiles can't reach some of them because there's enemy on their path).
Log (kinda proof of it actually happening sometimes):

And layout:

What happened: I opened chest, seen corruptor and got scared, used movement infusion to run around it and used fan of knives that spewed 6 knives out because it targetted both of rares, but all knives (actually 5 of them, I think one that targetted corruptor reached it too late (when it was dead)) hit corruptor, instantly killing him (actually he was able to hex me before knives reached him, but it's because of non-instant travel time). He was where bow is located.

I think targetting mechanic should be altered to prevent this.

This may be related to why the Flame Bolt Demonologist weapon mod is straight murder when used in crowded rooms.

Anorithil's Corona works in a similar way. The talent description is pretty obtuse, but I think that this might not be a bug. It says that creatures block knives from hitting targets behind them and that you throw three knives at each enemy in the area.

If this wasn't a bug then you could throw 9 knives when you stand in one line (you enemy enemy enemy), but you only throw 3 because first enemy blocks targetting and so you can't target two enemies behind it. Corona and mindstorm work other way, as they can target ALL enemies in range (and corona can't hit wrong target iirc (but mindstorm can)).