Is there English equivalent of marathi phrase
Dhoghanchya bhandnya madhe (Fight between both) tisryacha fayda (will yield third's (outsider's) profit).
If two friends fight the third outsider will take away with the prize shield. So the wisdom says you should not fight with each other over something in front of third party otherwise the third party will feign as arbitrator and flee away with the bounty. I suppose there is a fairy tale which i don't recollect probably about a crow if i am not wrong.