DailyRich said:
Because the card tells you it can be engaged like an objective. What's the point of engaging an objective if not to do blast damage to it?
That's not really a rules point. However, if we are willing to accept that blast damage icons (which by rules only damage the engaged objective) work with Trench Run, then what is our grounds for saying that other ways that damage the engaged objective do not? We're arbitrarily deciding that one thing that works with engaged objectives works with Trench Run but other things don't. Why not pick only Target of Opportunity to work? Just as arbitrary.