The Unplanned Assault Conundrum

[Hog of War]

If you do not trigger op fire having bumped an unseen unit what does that mean? Are they asleep, did they misfire, would you even see them if you drove right through the hex (are they trying to hide)? In terms of game play weak or command units wouldn't want to draw attention to themselves with op fire on the other hand some units best chance of causing casualities would be to invite an assault by unexpected enemy units. It will be interesting to see which way the wind blows with this rule. I think I lean towards the SqB way rather than be able to pull out of it. The battlefield is no place to be tooling around blindly especially since we have a patrolling function with our recon.