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 5 months ago (edited) 

This is where it gets Grey.

Did he or did he not.

He did return the tokens. But he did so under threat. So I don't know how to classify it. So I am asking...

Here people go to jail for something like that or much less...

So I don't really know...

IMHO, you must pay Louis, as taraz said people should know there is a bounty that would be paid in case they found a vulnerability and report it.

The best course of action in this scenario could be to fix a amount that should be paid to Louis and for the future efforts made by anyone in this regard. As Louis returns the amount after being threatened, you can cut out a penalty amount from that total. This penalty amount could be fixed too for future, as well.