Emperor's Children Thrill Seekers army rule and characters.

[ExeterOborach]

Hello everyone,

Thrill Seekers let's Emperor's Children units Fall Back from a unit and then charge or shoot an enemy unit as long as it isn't the one you were just engaged with and that another friendly unit has not yet attacked. 

So a situation came up that we weren't sure about. 

My buddy's Daemon Prince was engaged with my Khârn and Berzerkers. The Daemon Prince fell back so his Noise Marines could shoot Khârn's unit. He killed all the Berzerkers then finished off Khârn. I rolled a 2+ to bring back Khârn with his once per game rule. My buddy then shot Khârn with his Daemon Prince that just fell back. We came to the conclusion that since Khârn is now alone he became a "new unit" , different from the one he just was with his bodyguard, thus not violating the stipulations of Thrill Seekers. 

Is this correct? 

Thanks.