Was doing Odin II today, and got killed by the Zantetsuken Kai while my Migawari was still in effect.

Heres the following Information:

Current HP: 2,177

Used Migawari: Ichi
Odin used Kaustra (Dealt 246 Damage)
Odin Used Zantetsuken Kai (dealt a killing blow with a damage of 2,014).

Something wrong with the Ninjutsu, or do i not understand its concept well?