According to French Eurosport, it's all part of the plan to chase stage victories, and there doesn't seem to be a plan to place in GC.
To explain: often, a group of riders will try and break sway from the peleton. The peleton will decide to let them go, or pull them back in really quickly. Then, another break may form, until one is allowed to stick. The peleton might not let certain riders get away, as they pose a risk to the GC ambitions of several riders not in the break (or for other reasons, such as the Armstrong and Simeone incident*). Once a break is established, the peleton, being able to move more efficiently, will let them get ahead, but want to keep them in catching disyance for a finish. Sometimes, tje break survives, which os tne BEST THING EVER, but often they get caught between 1km and 20km from the line. Or 200m, like Jack Bauer, which was both racing at its finest, yet cruellest. So, Pinot, being 4 minutes down, might be allowed to go off on a jolly, as he won't threaten Froome et al.
*here:
http://www.bicycling.com/racing/armstro ... down-rider and
https://en.m.wikipedia.org/wiki/Filippo ... prov=sfla1