@Heno3HaTaTa we shared your screenshot with the development team and it appears your game was out of sync, which is why upon restarting your enemy is alive again. Have you experienced any connection issues recently?
This would be similar for other players who restart and see the enemy is alive, the game has gone out of sync.
Again, if anyone else experiences the enemy remaining on the board without burn being applied and you can drop any further information please do! 
Still actively looking into this though!