Graves skulls can proc QSR up to 6 times at once

[aekobear]

If the skulls are tossed around 1 meter away from an enemy, the reliably proc QSR once per skull, causing a 1600 item to do crazy amounts of damage.

Happens in match 53866772 at around 25:30, where graves kills mina

I also am able to reliably produce it in sandbox. The trick is knowing how far away to throw the skulls. See attached video