PRETORIA, July 11 : Scotland coach Gregor Townsend said his side were frustrated at letting South Africa off the hook in their 42-28 Nations Championship defeat in Pretoria on Saturday that denied the visitors a first away win over the Springboks.Scotland were the better side for large parts of the game but critical errors and a failure to take their opportunities when they had a one-man advantage early in the second half cost them. They also conceded several soft tries against a much-changed, relatively inexperienced South Africa team who rested several of their regulars and were missing many others through injury."We're really frustrated we didn't get more points on the board in the first half and in that period when the Boks go down to 14 men," Townsend said. "I'm massively proud of the