Tricky one here.  Technically, having the Pater effectively knock into something on its way out, which in this case proves to be a critical mistake, is an auto of the character... on the other hand, the pauldron is clear on the reference picture, and Doc Doctor [i]did[/i] ignore it completely, and similar situations would result in viable hits (e.g. someone walking into a magic circle).

I'm with Doc on this one, though.  Technically, Melon would have been justified in writing that the Pater knocked against something if a) he had prepped in some manner (for instance, in the post where he slammed back into the wall, he might have described shifting his right arm into a position that would make the pauldron a greater obstruction), or b) if it had been a very obvious obstacle (something the Pater would have trouble getting over).  In either case, if Doc had ignored it, that would have been an oversight on his part.  However... based on the reference picture and the size of the mech (and a couple of handy measurements), it ain't that big.  Heck, I could probably jump over it myself, if for some reason I found my frail human self trying to get off the mech.  Essentially, Melon's argument is viable in theory, but in practice the pauldron is too small to be plausible as an obstruction, and thus having the Pater essentially crash into it (a mere brush would be difficult to 'feel' from inside the mech, unless it has pressure sensors or something like that) is pretty much assuming it's hella weak and/or lazy.

Tldr; the Pater makes its jump unobstructed.