Exactly. Which means CONTEXT is crucial since the two situation are dramatically different: in one you can roll to "score" and in the other you can't.I understand but I can't but help harp back that there was no oppo in contest, and what's to say he wasn't rolling over to get up ( just once is a natural action to roll forward too) and hey presto he's on the line!!
For eg Would you allow a player in mid-field that's on the ground to roll over once and get up to continue running because there was no oppo near him? I'm sure you wouldn't PK that? So why not allow it near the try line? ( I see this as a similar quandary as the thread covering the tackler releasing immediately to allow the bc to reach out and score).
If the player had to get up before going for the line, that would take longer so the critical proximity distance increases.Again, I'm talking about a roll immediately and no oppo in close proximity to contest as described in the OP.
However I still think he is using an illegal technique to get close enough to score, and I don't really see why we should be sympathetic. If there is no defender near enough to intefere, then he should do it properly; if one is near enough then we seem to agree it is a PK.