Questions about subterrain blast from thunderfire cannon

[Epy]

I've got a question about subterrain blast from thunderfire cannon. It is a str. 4, ap - weapon and with Tremor special rule. It is said that the unit hit by subterrain blast will be slowed down in the following movement phase. The question is, how many models in that unit I have to hit in order to get them slowed?

Also, I'm not quite sure what does the 'hit' mean. Does it mean the to hit roll or to wound roll or any unsaved wound? My understanding is that, if any model in a unit is got 'hit' by the blast (even no actual wound caused), the whole unit got slowed down.

[Warp Angel]

You don't have to wound. You just have to have a model under a template for it to take effect.

 

It's great for screwing with bikers and jump pack models.

[Steelmage99]

I've got a question about subterrain blast from thunderfire cannon. It is a str. 4, ap - weapon and with Tremor special rule. It is said that the unit hit by subterrain blast will be slowed down in the following movement phase. The question is, how many models in that unit I have to hit in order to get them slowed?

 

One, as a unit moves at the pace of the slowest member.

 

 

Also, I'm not quite sure what does the 'hit' mean. Does it mean the to hit roll or to wound roll or any unsaved wound? My understanding is that, if any model in a unit is got 'hit' by the blast (even no actual wound caused), the whole unit got slowed down.

 

Correct, "hit" means "hit", "wounded" means "wounded" and "killed" means "killed". As matching the corresponding "roll-to-hit", "roll-to-wound", "roll armour saves" in the shooting rules. Pretty simplified, I know. But it demonstrates that when the rules say "hit", they mean "just a succesfull to-hit-roll (or whatever replaces the to-hit-roll) is enough".