Hey all...a question that came up in a game. My friend and I want to make sure we resolved it correctly:

Nightcrawler and Thing are on a rooftop.

Thing has a defense of 16 and Invulnerability.
Nightcrawler is at full health sporting a 10 attack value
Beast perplexes Nightcrawler's attack to 11.

Nightcrawler rolls his first strike, needing a 5, and succeeds.
He strikes again, needing a 6, and succeeds.
He strikes again, needing a 7, and rolls a critical hit.

We decided that he made 3 successful attacks for a total of 4 damage (1+1+2). Things Invulnerability soaks up 2 of the clix. So Thing takes 2 total damage and is knocked back 2 squares from the doubles. The knockback throws him off the roof for 2 more damage.

So after the ordeal, Thing takes a total of 4 clix of damage.

Is this the correct way to resolve the attack and knockback?

That was all exactly correct, yes. Nicely done.