I took the medium (or am rather) skirmish in deneb, and finally having taken out the Itani Teradon which was attacking the serco hac, I move to assist the serco Teradon and Trident to bring down the Itani hac's shields. However, the Teradon was only using its agt to attack small ships and Itani Tridents, and refused to attack the hac even though it was well within range.

Edit: At this point, there is no real value to my participating in the mission because fighter skirmish is more enjoyable if I want to shoot small ships, and the remaining Serco Teradon rips up the Itani Tridents faster than I can get to them.