When the snipe and the clam fight, the fisherman profits: if you two keep arguing, only someone else will gain.
Tips
history
The second half of 鹬蚌相争，渔翁得利, from the 战国策: 苏代 warns the king of Zhao that while a snipe and a clam lock onto each other, a passing fisherman catches them both, and that Qin would do the same to Zhao and Yan.
