obs mechanic

[bbman]

I was curious as to the steps/procedures an umpire should take for an obstruction call.
Here is a made up situation. Runner on second, single to outfield, third baseman standing on the bag. Runner contact.
Make this regular/real baseball. (Not HS)

What is the signal? Right fist out to side or both hands up?

Is it a verbal signal or silent? I have been with umps who do either?

Assuming play continues, as it should, and runner is thrown out, do you call him out and then call time? Award the base?

Or, do you call him safe no matter what due to the obstruction?

My thought is that it is silent, right fist out, call him out, call time, award base(s)