In the 25th over of the chase, MS Dhoni came into contact with the bowler Mustafizur Rahman while running between the wickets. It was not the first time in the game that the Bangladesh debutant had got in the way of an Indian batsman. Rohit had to run around the bowler as well earlier in the innings. Dhoni, however, held his line and thudded his left arm into Mustafizur who then had to leave the field for a bit. In this case, the bigger person did not fall harder.
Personally, I reckon Mister Fizzer was pulling a fast one by getting in Dhoni's way; Fizzer takes a quick glance at MS then continues into the batsman's path.
On the flap side. Imagine the rumpus had an Aussie barged in to Fizzer like Dhoni barged into Fizzer. Cry havoc and let slip the Wild Dogs.