I know this is forbidden or at least frowned upon but I can't for the life of me find in the rules or FAQ that states this is is not allowed.
Can someone help me out? This came up last night in our casual game where my opponent was trying to estimate where he'd wind up after a boost and barrel roll and I said they couldn't do that and my opponent disagreed. I'd like to show them the rules rather than just "people on forums said so."