Grapling Struts (Closed) reads:
While you execute a manuever, if you overlap an asteroid or debris cloud and there are 1 or fewer other friendly ships at range 0 of that obstacle, you may flip this card.
So, if the condition is met, the timing window for this ability is "while you execute a maneuver", and it goes to the ability queue. But taking the effect of the obstacle has the same timing window (rules reference, p 13). And since game effects allways are resolved first, you still have to roll damage before you can flip it.
Please tell me I'm wrong?