3rd eye
 

https://www.youtube.com/watch?v=BvMTRHHZO2M

from about 4 seconds on you can see a kid in a red coat with the corner flag.

a few seconds after entering the pitch ne runs back to the stand being chased by what appears to be a steward.

watch what happens next when they re-emerge into the shot

:D:D:D:D