Neurological perils of power kites

A 38 year old man spent several hours flying a power kite, towing himself along a beach on a buggy. The wind generated sufficient force for this to be vigorous exercise. An hour later he developed a frontal headache, left-sided periorbital pain and neck pain. This persisted and two days later he noticed drooping of the left eyelid and difficulty focussing on near objects with that eye. He presented to hospital eight days later.