Centre-back Koscielny was left off balance on the edge of the area and tried to pull his foot out of the challenge but the winger hit the ground after minimal contact and the referee was quick to point to the spot.
Gambhir dragged Broad through midwicket to the rope and then Yuvraj clubbed the same bowler for consecutive maximums - one a front-foot pull over long-on and the other a remarkable flat drive over the covers.