Bingo. However, Fireteam tuyet stumbled across something in the vex network before they were killed/(whatever vex do to people to make them lost in time) -pocket infinity grimore in the ghost fragments of the vex, it talks about a group of people stuck inside of a vex simulation who call out to rasputin to try and escape this simulation. Dr shim was one of these. There's a bunch of blanks, however pocket infinity talks of how it found in the vex network the ability to create a time loop and fire immediately. It doesn't have Dr shims name, however I don't think it's a coincidence, that 1. The fireteam called out to a warmind, and the gun has rasputin written all over it 2. It holds a vex secret of time loop 3. Dr shim has a protocol to eliminate invaders from his archive..