OOB = out of bounds, I guess. One of my numpty errors last year was to re-tie my laces between controls *before* the road crossing, d'oh. Good running, have fun today.
Yes, that's right. There were two (unnecessary) small purple lines which were meant to accentuate a passageway (actually steps down to another level) which looked like out of bounds marking (of which there was loads on the map)
I can see that on the Routegadget now - very confusing