You then either roll a Toughness, fortitude, or will check to see if the damage is substantial.
So with a 12, this thing misses you against essentially your AC of 19.
The Thing's Initiative - (1d20+2)
(20) + 2 = 22
Tune's Power - (1d20+0)
(7) = 7
Init - (1d20+3)
(1) + 3 = 4
Initiative - (1d20+3)
(14) + 3 = 17
The Thing Attack - (1d20+10)
(7) + 10 = 17
Close Combat (unarmed) - (1d20+11)
(4) + 11 = 15
Until then Knife +13 - (1d20+13)
(3) + 13 = 16
Tune's Initiative - (1d20+3)
(4) + 3 = 7
The Thing's Claws - (1d20+10)
(15) + 10 = 25
Close Combat (unarmed) - (1d20+11)
(11) + 11 = 22
Toughness check for the thing - (1d20+12)
(15) + 12 = 27
Hit - (1d20+8)
(17) + 8 = 25
Toughness check for the thing - (1d20+12)
(9) + 12 = 21
Kinfe to "The thing" - (1d20+15)
(6) + 15 = 21