Halfpenny kicked another nerveless three points, after the Lions earned a further penalty at the scrum.
When the Australian forwards couldn't live with the Lions at scrum time yet again, prop Ben Alexander was sent to the sin bin.
Halfpenny again made no mistake, to extend the Lions' lead to 19-3 after 26 minutes.
More top news
After yesterday's fun and games today will feel much calmer altogether!
Well Ex-hurricane Gonzalo certainly made for some heavy weather today. But the winds are already easing.
Club members are being reminded of an official warning scheme, with repeat offenders being asked to leave.