not a terrible idea if its your last order and you want the opponent to deal with you on their turn. situational at best, I agree. certainly not something to do on turn 1, but if your opponent only has one active turn shooter left and there isn't much around him, engaging and using the engaged state as a defense isn't the worst idea.
Its debateably legal and generally frowned upon. Unless you have climbing plus. The tip would be don't declare engage with a climbing plus model.
It's only debatably legal because some people refuse to accept it and not allowing it is a house rule, but RAW it is legal. As for it being frowned upon, that is completely irrelevant to if it can be done or not. So the tip is, find out from your TO if they are house ruling and if they are not then simply never declare engage.
No, its not that clear cut. But agree you should clarify with the TO/opponent beforehand. Until such time as a FAQ comes out, its best just to avoid the situation by not trying to place peoples models on walls. Engage is bad enough, do you really need to drive the screw in further?? Cause yes, it still requires interpretation. So why?
For example, when you don't want to risk yout tarpit intended to strip enemy of LoF to be killed on your own order. Not quite. If your models end up standing perpendicular to each other, its still debatable whether it's b2b, even with FAQ around.
Why would it be debatable? The FAQ was pretty clear about any part of the silhouettes touching being considered B2B. The enemy model would have to climb kind of high up a wall for you to not be considered B2B.
The only reason why its even remotely legal is because palanka said that a climbing plus model can put a model in btb with it on a wall. No ruling has been made that says you can put a model perpendicular to you on a wall and there is even rules in engage explicitly stating they cannot even go up walls. So saying perfectly is a bit of a stretch.
