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		 I've gotta say I agree with Terrell.  Especially in the US where the original offender could be carrying a gun, I think I would be having a good think before getting involved.  No-one should be forced BY LAW to intervene.  I'd like to think I would intervene, if this case arose, but I can't say I'd want to see any bystander arrested because they didn't. 
		
		
		
		
		
			
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