Tomorrow is a rest day though, and Froome didn't show any weakness, and neither did Bardet really, and Aru yo-yo'd off the back a few times before latching back on. So maybe sitting on Froome means you take a few seconds on him at the finish in bonus seconds if you are lucky, but in the process you give away half your buffer against someone that is looking stronger than you. That is called winning the battle but losing the war.