I was playing around in the range when I discovered that Yoru can drop and pick up guns as he pleases in his ult.

The way to do this is simple:
Once Yoru is in his ult, he can simply 'ghost equip' his gun by pressing the button associated with it(2 & 3 by default) or scrolling. Once 'equipped' he can drop it as if he was holding it in his hand.

I've tried this with the spike, to no avail.

https://reddit.com/link/udttrt/video/jozsbf6oj9w81/player