This is either a bug report or feedback. I took a medium skirmish tonight, something I seldom do since I don't normally like to commit that much time to botting alone. During the skirmish both Teradons were destroyed early on and neither re spawned.

If this is the way the mission is designed, fine, but I would not recommend it for the solo player. I logged when the enemy was down to around 200 because I couldn't be bothered to hang out long enough to kill another 10 Tridents. I would have hung out longer if the Teradons had re spawned in order to defend my connie & to try to set up a situation where I could take out the shields on the enemy connie.