**Your example scenario:**

Vamp starts full health (seven boxes):
>[ ][ ][ ][ ][ ][ ][ ]

> 0 -1 -1 -2 -2 -5 X

Vamp takes 4 bashing.
>[/][/][/][/][ ][ ][ ]

Vamp takes 3 lethal. This "pushes down" his bashing. The bashing damage in V20 doesn't roll back around, it falls off the track. This is enough to Incapacitate the Vampire.

>[X][X][X][/][/][/][/]

Vamp takes 2 Aggravated. Well, an Incapacitated Vamp is immediately killed by any Agg damage

**V20 pg 283**
>Further  damage  suffered  by  an  incapacitated vampire sends her into torpor or, if the damage is aggravated, inflicts Final Death on her. 

But, for argument's sake, let's say that your example Vamp was sitting at
>[X][X][X][ ][ ][ ][ ]

and took two points of agg:
>[ * ][ * ][X][X][X][ ][ ]

They'd be "Mauled"

**Applying Damage Penalties**

**V20 pg 282**
>The  number  to  the  left  of  the  lowest  marked  box indicates your current dice penalty. 

So, as soon as you take damage of any kind that marks the "Crippled" box, you are at a -5 dice penalty to any action that would be affected by your injury. I usually read that as *any* action, since pain usually detracts from concentration as well as mobility. You can give vamps a little leeway with this, since they feel pain less acutely, but that's a Storyteller judgment call.