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不想傷口撒鹽,然而這事上,你在現場,確沒有介入處理,真正是失職. 個人會建議您日後遇到這種情況一定要製止,必要時應該報警處理.

Most can cause serious injury to the eye. The BB guns that fire 4.5mm steel bbs can cause serious wounds. In extremely rare cases they can cause death if the muzzle velocity is high (500 fps or more) and the person is shot at close range. But death is rare because round BBs don't penetrate as good as pellets/darts.
https://www.quora.com/How-dangerous-are-BB-guns