We've seen this multiple times over past few weeks.

Stefon Diggs not satisfied with timing w/ Josh Allen during against-air work... so they do it again.

Check out how Diggs has to sort of stop on 1st throw... then is hit in stride by Allen on 2nd... w/Diggs reaction.#Bills pic.twitter.com/bWs7xxbWd9

— Jon Scott (@JonScottTV) September 1, 2020