Tank shocking monsterous creatures

Talking with a 'Nid player (guess which ) and trying to find a way for a space marine army to deal with monstrous creatures with my current army list (besides blast the cheese out of them). We're thinking that tank shocked monstrous creature would behave like infantry: Move aside on the successful test, or death and glory. I cannot think of how to allocate wounds in a 'Death or Glory' situation, as it seems like pure cheese to be an instant kill with a unit having 5 wounds... While still understanding that this would be the choice of the player controlling the monstrous creature.

Thoughts?

pg. 69 of the 5th ed. rulebook. The creature (one model) would get one attack shooting or cc that hits automatically. If the vehicle is not stunned, immobilized, or destroyed the tyranid would die regardless of wounds, no saves at all.
As well the Monstrous creature would not need to test to begin with (fearless or immune to pyscology whatever rules Nids get. I don't know), you choose if you want to move out of the way or Death or Glory.

Ah yes. That's a fair assessment. I think the crux of my confusion was what were valid targets...

"If an enemy unit other than another vehicle is reached..." from pg 68 and a lack of any special rules under the monstrous creature listing when i was assuming there would be (and with my understanding that these rules themselves are new, i wouldn't put it passed GW to have forgotten)

On a separate note: I would like to apologize for any misunderstanding caused by me in my other thread. I was attacking the idea, nothing else. I'm not known for "eloquence".