Being Tank Shocked from Reserved Outflanking Tank

So this happened to be the other day, had a unit very close to board edge, my opponent had an outflanking Rhino. He declared a Tank Shock and kind of just put his rhino on top of my unit.
Did the Death or Glory thing, passed Ld test, hit and stripped hull point, but still lost the immobile gun platform and crew had to move out of the way.
I think this is more or less right.

My questions are
-Does a unit have to be fully on the board before it can Tank Shock?
-Is there any way to prevent it happening? Anything that prevents outflanking etc

Cheers

I regret to say there is a specific paragraph for this:

Quote :

TANK SHOCK FROM RESERVE
A Tank that moves onto the Battlefield from Reserve may attempt a Tank Shock. This must be declared before the Tank moves onto the board.

Unfortunately there is no way to prevent Outflank. The closest thing would be Interceptor, but this would only allow a retaliation at the end of the movement phase. It wouldn;t stop the tank from coming on or performing its Tank Shock.

Squidmaster wrote:

I regret to say there is a specific paragraph for this:

Quote :

TANK SHOCK FROM RESERVE
A Tank that moves onto the Battlefield from Reserve may attempt a Tank Shock. This must be declared before the Tank moves onto the board.

Unfortunately there is no way to prevent Outflank. The closest thing would be Interceptor, but this would only allow a retaliation at the end of the movement phase. It wouldn;t stop the tank from coming on or performing its Tank Shock.

Yeah, I didn't think there was. I was just hoping for some Commorragh-cunning I guess.
I'll just have to be more cautious with my initial deployment and leave someone capable of hurting Tanks with the platform.