It could be something as simple as them deciding in training that they would take the next penalty this way.
My opinion is that the reason they even practiced taking the penalty this way in training is because of the missed penalties recently and a bit of cheek.
Why do you think they took the penalty like this?
Purely for cheek and a production of the current euphoric state the team is in(good results, players getting along, good chemistry etc). They decided to do it sometime during training because it would be somewhat unique and have the confidence in one another to pull it off.
But again, don't think it has anything to do with missed penalties. If anything, I expect Lucho to condemn that behaviour where you are avoiding to take a penalty out of fear. If it would be clear to Lucho that Messi doesn't plan on taking the penalty in straight fashion out of a lack of confidence, I expect him to tell Messi either 1 of 2 things: 1) well, just take it during a lead comfortable lead. It is an opportunity regain some confidence. 2) Just let Suarez take it then.
Possibly also a homage to Cruijff. I am not convinced yet at this point, but it IS a possibity.