You do acknowledge that Turbo is decided after the consent between two nodes, right? Just because Alice opens a channel with Bob, and they choose to settle it unconfirmed (which is what makes a channel turbo), it doesn't affect Charlie somehow. If Alice wants to send money to Charlie, it's Bob who'll give him the money, who doesn't have a turbo channel with Charlie. If Alice screws with Bob, and double-spends her channel opening transaction, Charlie will have normally received the money she sent him; it's Bob who's left unpaid.