Looking back on this, the Indianapolis Colts' Kelvin Sheppard would probably like to change how he celebrated the result of the play.
Teammate LaRon Landry had just taken a knee to the head while making a tackle. Sheppard was pumped that his teammate made a nice open-field tackle, so he hit Landry's helmet a few times.
According to NFL.com's Dan Hanzus, Landry suffered a concussion on the play.
NFL players routinely hit each other on the helmet, so this is nothing out of the ordinary. However, the timing couldn't have been worse.