Here he is guarding the towpath....
... and he's off, he's spotted some bikes in the distance
escorts them over the bridge, until the pass moored boats and he looses sight of them.
He's spotted them again, and off he goes.....
full attack thrust...
gerroff my land, and don't come back!
No, you can't come in.
At this point, the Dad and his kids threw their bikes and did a runner!
It was left to Dave to distract the swan whilst the family ran back & picked up their bikes.
Don't mess with me!
He's off again
He'd behind you!