There was no mention of the brick tanked ship doing anything, other than being brick tanked.
I am aware of how auto targeting missiles work. Interesting to note though, if the pointing ship was first to engage, the auto targeting missiles would have fire at it first. If the avalanche has drones assisted to it, those drones would have attacked the pointing ship until it was dead, regardless of the range of other ships partaking in the engagement. One of the unique features of auto targeting is instant response, even a fully boosed fast locking frigate can’t beat a single click activation speed.