Check Swing Mechanic

[IRISHMAFIA]

A mechanic I do not understand.

In a check swing situation, the mechanic is to point with the right hand for a left-handed batter and the left hand for a right-handed batter.

Why? It is not like the mechanic to hold the pitcher so the signal is in the open for all to see as it is just the opposite. This mechanic actually places the signal between the catcher and the batter. Since this isn't an issue of visibility, why would an umpire be asked to point with the right hand?

Since I was a young pup, I was always taught to not point with the right hand as it could be confused for another signal. Granted, I started in baseball where a "point" could be anything from a strike to an out to the direction of 1B. So ingrained is this train of thought, I have a hard time raising my right hand to indicate an IFF.

Any other thoughts on this mechanic?