Cho Gall get penalization for bug

Way to reproduce the bug:
1- Prepick cho and gall with a friend with your team as 1º pick
2- At 2º pick, when you have to choose 2 champs, one of your parthners pick a champ, and the other doesnt pick, so we cant select our champ.
3- You both players, cho and gall, get banned from ranked. Good luck, have fun.

I do not see the bug here. You did not lock in a hero because your choice was no longer valid and so you get slapped with draft dodge penalty (not ban).

You both need to pick the cho gall pair in one of the double pick rounds. If you cannot because someone else on your team picked a different hero, then you need to wait until the second double pick to try again (and hope a troll does not grief you) or preferably fall back to your backup solo heroes.