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					Originally Posted by umpjim  What's the avoid contact safety rule? | 
	
 Fed 8-4-2(c) requires runners to "attempt to avoid a fielder". 
...The OP said  "The runner jumps 
over/around the 3rd baseman". I have seen plays where runner was doing everything right and then a fielder does something wrong and causes runner to do something in an attempt to avoid a collision. I do not want to OOO this kind of action with a hurdling call. 
I know what a hurdle looks like and I know what avoiding contact looks like. On a dirty play like the one in the OP, you have to decide what you've got. Was he more going over (illegal) or more going around (legal).