Friend's iMac finder not responding because of failed massive drag and drop?

[Jerry®]

My friend has a 2007 iMac running 10.11. Last night a friend of his accidentally chose about 1000 music files from an an external drive and half-ass dragged them to the desktop of the iMac. My friend had unplugged all the external drives from his iMac by the time I got here to rectify the situation and all that happens is the finder just spins and spins. I relaunched it and it's ok for a second or two but then starts spinning. The system isn't completely frozen but it's difficult to do anything. I even booted it up into Safe Mode and still the same thing. My theory is that if I delete the finder plist it might do the trick but I could be wrong? Anyway to do that I'd have to be able to get to the right finder window or terminal but with the finder non responsive I'm at a loss.

Any help would be greatly appreciated.

Here's a photo of his screen showing all these aliased music files that apparently are holding the finder hostage: