We frantically tried to reach the Kenya Wildlife Service veterinary officer who was in Tsavo treating an elephant, and continued to monitor the zebra well into the night.
Thankfully, the next morning, he had managed to get the arrow out, we suspect by rubbing against a tree or something. The wound had no indication of the arrow head being embedded still, and the herd had calmed down considerably.
The teams successfully apprehended a suspect who had in his possession illegal palm wine, two snares, and cooking items. He also had what appeared to be a considerably large unidentifiable species of sea fish. He was booked at the station and was sentenced to community service.