Jump-Step to 2nd Base

[mach3]

Hi,

I know it is an old discussion but it came up in my association again.

Sit.: R2.
Pitcher does Jump-Step Pick-off to second base.

Now people come up and argue that RHP can only do that to fist base and LHP to third.
I say, in OBR it is nowhere mentioned, that he can only do that to fist base. If we say, the jump-step is a direkt step to first/third base, than why should it not be a direct step to second, since the movement is about the same.
They say PBUC limit this move to first (third) base, but I cannot find it there.
I showed them J/R who does not have any reference to any base in it, but it wasn't enough for them.

Am I wrong? If not, what else can I tell them to be convincing?

thanks

Raoul