When they finally got within striking distance of the Scottish line, Tom Riley drew the Glasgow line before his deft pass sent Blair under the posts for a seven-pointer.
Bristol ignored Wasps' swagger and hit back in spectacular fashion when Tom Arscott straightened his line to crash over from a short pass from brother Luke.
Spain's Adrian Palomares is the new leader of the Tour of Britain after pipping Tom Stubbe to the line during the fourth stage between Rotherham and Bradford.