champ select glitch that forces people to dodge

A friend of mine just told me about something that happened to him earlier. he was in ranked champ select, and another player told him to go to edit masteries page and press space 3 times. upon doing so, he tried closing out of his masteries and it wouldn't let him. and the mastery page screen happened to entirely cover his champ select screen, forcing a dodge as he had not yet selected a champion.

after being told about this, I tried it in a custom game and to my surprise, had the same effect.

my friend isn't the kind to post or view the forums, so he'd never report it. figured I'd give everybody a heads up as this is a sick joke that loses people LP