Houston, We've Got a Bribe - GOLD
I agree with everyone else that there doesn't appear to be any bribery going on here.
Players are allowed to share prizes unconditionally at any point in time, so asking for the split unconditionally as it was presented here is fair game.
The MTR does say that the decision to concede cannot be made in exchange for a match result, which was not the case here, since the split affected only Nick in as much as it was wholly his decision to concede. However, it also states that such a decision may not be *influenced* by a split, which is clearly the case here, since Nick has little reason to concede in the absence of a split. However, the spirit of this rule appears to be to prevent collusion, and collusion needs two people to collude. Andre didn't mention anything about a concession before agreeing to the split, so there is no obvious collusion going on here, so I feel it would be against the spirit of the MTR to apply an infraction here.
It's possible that Nick has committed Unsporting Conduct - Minor in as much that it could be considered inappropriate to offer the split a second time, when the decision could be influenced by the games that have already been played, and depending on how the question was asked and the dynamic between the two players I would not hesitate to give this penalty if I felt that Nick was in some way trying to browbeat his opponent into a split, even if the split itself is unconditional.
My investigation for this call would include interviewing anyone who arrived with these two players if I felt that some kind of non-verbal communication might have taken place that would cause me to suspect real collusion here.
I would also ask the floor judge if they suspected any sort of non-verbal communication, and if they had felt that it was unusual for the split to be offered a second time, and inquire about the attitude of the two players during the match, and especially regarding the split. I would also remind the floor judge that players are allowed to split prizes, and give them a brief reminder of the kind of things we're looking out for to find collusion, such as if statements, or implications of a reward for a certain match result.