Ok, Gronkling and I discussed this a little:
We both agree that the combination seems a bit odd, but still we still think it's acceptable. + I would even call it a neat trick.
Explanations:- This would also work using a steel slope with terrain on it. So the OWW acts intended like steel to the basher.
- As Simon said: The upwards movement itself is explicitly allowed in the code (LemGame.pas, line 3368, in current commit 8614164). The max angle was discussed before in a topic.
- As the miner tunnel is too high, a builder is nessesary to keep the rising basher going. This builder here is
just high enough to reach the basher check line.
- In reverse, downwards movement would also be possible: A downwards bash in a fencer tunnel needs no set-up for this. A downwards bash in a miner tunnel would need a higher builder.
So, as it is maybe a bit weird to see, it is 100% logical physics-wise. I think the main reason it seems weird is that OWWs are not really seen as steel most of the time and the extra builder filling is at the very low edge of the basher checks. Again, using a steel slope instead of OWWs and I would argue that it doesn't seem weird at all anymore.