Physically assisting a runner or not?

[C'monBlue]

The other day I saw this in a tournament game (which I was not working). FED rules. Runner on second, ball hit to the outfield, R2 about to make a wide turn at third when the third base coach maneuvers himself directly into the runner's path. No contact is made and I'm not even sure he left the coach's box, but his intention was obviously to hold up the runner by blocking his path. My question is this: Does this qualify as "physically assisting" or does the coach actually have to grab him to get the call? Thanks in advance for your wisdom.