When falling as a hero with a cape or some sort of cloth on them it stretches really far as shown above.
The other heros ive seen this with other than pocket are Abrams and McGinnis
Edit: You have to be still while falling for this to occur and as soon as you move it fixes it.
That is match id and time where it is visible in replay. In further review it looks like Abrams did a leap - I cannot tell if this is the Ultimate ability as the model was not visible. Abrams last hit was by grey talon Ultimate while mid-air.