Days after the UK - at US request - seized a tanker filled with Iranian oil near Gibraltar, a UK tanker in the Persian Gulf has made an abrupt u-turn and abandoned its mission to transport Iraqi oil to Europe. Now sheltering in Saudi waters, the tanker fears a tit-for-tat Iranian retaliation. Is this a case of "unintended consequences" for the US-engineered July 4th Iran tanker seizure? How far will this escalate?