How Victors deal with Back EMF, and current from the Motors.

[Generalx5]

I know that the MOSFETS on the victors have a Diode built into them. These diodes prevent Current from going backwards, but there is a limit to how much (I) is allowed anyone know, as for voltage, I think there is a high voltage protection built in as well.

Are there any electronically controled protection in the Victors? Are are the MOSFETS themselfs good enough to do the job?

If a Mosfet is not conducting and I apply a reverse current, will it be alright?

And theres this other thing that happends, when We push the robot around when its powered off, the Victors are able to turn on....from the power generated by the motors. But how is that possible? More in terms of the Victor and its insides.