Attacking a Full Bridge Hex by Air

[Dogbert]

An interesting result the other night in a D85 game. I had an engineer unit wiring a bridge for demolition (in travel mode, on bridge performing bridge ops) only to be wiped out COMPLETELY by an air strike.

Now, I don't really have a problem with the unit being wiped out completely. They are on a bridge over water after all. My problem is that an air strike could wipe them out and yet not damage the bridge! Here is a unit wiring explosives to a bridge that can be wiped out without doing any damage to the bridge? It seems to me that there ought to at least be a chance that the bridge is damaged during an air attack against it.

In any case, this doesn't seem to make sense to me. Is there a reason for this?

Note that the inability to blow this one bridge isn't going to affect the outcome of the game one way or the other. I'm just curious as to the reason for the result.