Here is a link to a post I did in “Audio & Video …”
I made an interactive graphic on Desmos where you can see the locus of points where a second shooter might be, provided you have a second microphone of fixed and known location; just by measuring the time gaps between, say shots 3 and 4 (or shots 8 and 9) on recordings from different microphones. And provided one sound source location is known.
Should be able to identify location of shots 10, 9, and if 123 vs 45678 are different locations. If you have more than 3 recordings (from different places), should be able to triangulate and get a fairly accurate spot.