Dingdong, bullyouknowhat alert

[rajpoot]

I don't don't know about you but I never carry iron staves around. This was no ordinary rape.

It was a private bus. It was not a large iron staff but a rod....probably something like a crowbar from the tool box.
You're basing your theory on a very flimsy base.

Quoting from Wikipedia article -

When Awindra tried to intervene, he was beaten, gagged and knocked unconscious with an iron rod. The men dragged the woman to the rear of the bus, beating her with the rod and raping her while the bus driver continued to drive. Medical reports later suggested that the woman suffered serious injuries to her abdomen, intestines and genitals due to the assault, and doctors say that the damage indicates that a blunt object (suspected to be the iron rod) may have been used for penetration. That rod was later described by police as being a rusted, L-shaped implement of the type used as a wheel jack handle.