Wack thing with drake steal

Ok so I was playing urf with a friend, and he had a nice drake steal. He was fiddlesticks so this might be a non issue in the future, but when he stole drake and it announced he did both of our screens went a bright white. Idk if it did for the rest of my team or the enemy team. but yea. His was his whole screen, while mine was just the bar for the drake steal. It did however display the icons for who stole.