This sample is unlike anything we would have encountered before. The body in the suit has no differences greater than the differences between the other Advent soldiers. However, it is dead. And it died quite precisely before it collided with our soldiers in battle. The corpse is in the second stage of decomposition, which raises the question: how this body can not only move, but also aim to shoot? A possible answer to this question is the rifle arrangement that these soldiers use. It is something like an antenna, concentrating energy around the soldier. If this theory is correct, then the soldier is just a puppet of a controlled psi clot as well as the zombies he raises with the only difference is that he has an "antenna".
Note doc. Taigan. Psi clot enveloping this soldier is too weak for free movement, but all the data indicate that this is a completely new, reasonable kind of aliens from psi fields. There is a chance to encounter more powerful representatives of him, who do not need someone else's body or antenna.