I have case on Stack Overflow where I answered question having some bounty award. question is not accepted but have positive score. Apparently, another answer provided by another user have same upvotes and We have same score.
If both answers are not getting accepted, then possible half bounty award will be provided to one who get highest positive score or earlier answer provided on having same score. So there can be case that,
I can downvote (by my perspective with silly/valid reason) his answer and get half award.
Same can be done by him to me and win half award.
Is there any Stack Overflow policy or mechanism to prevent/inspect such action?