No. Dorni moved in and killed two kobolds in the surprise round. He was engaged by another kobold in the round described in Post #10.
Close. Kurzuk passed his ST but took one more from the poison. Parnell passed one ST and failed the other, but still only took 1 point of damage from each. Remember that even a successful save vs poison does 1 point of damage.
Kurzuk is down 4.
Parnell is down 9.
Dorni is down 7.
Not quite. Dorni killed two in the surprise attack, but was attacked in the next round, described in Post #10. Instead of combat, Dorni cast the spell, initiative roll of 1 (From the bottom of post #14, Initiative. There are no dex mods for Initiative, so Dorni took the attack in Post 10, and then cast the spell against the snake.
Correct, only three PCs were at risk, and they all made their saves. Had they failed, the players would have rolled damage. Dorni was close to the snake, but it moved away from him.
Where's the fun, and random chance, in that?