The Thomp sight range seems really agressive.
I just had an instance where I spawned one, it took out a couple enemies (eeeeeexcellent) and then saw me, missed me, and then went out of sight, below the screen. I understood the terrain back there, so I was pretty sure it wasn't going to be a problem....
Potentially "famous last words" because it almost hit me coming back up. It definitly wasn't attacking an enemy.
I may be mistaken, but I'm pretty sure that should have been at what seemed like a safe distance.