Not to defend Samson for one minute, but I'd rather give credit to Turnbull. I was watching the goal again on Alba and his shot dipped, swerved and bounced right in front of the keeper. A keeper's nightmare in those conditions. I've seen better goalies than Samson let those in - Darren Randolph when he was at West Ham, for example.
So yes, Samson might have saved it, but Turnbull deserves credit for taking his chance.