Deviated Skill Casting
The trio had separated from each other so that their enemies wouldn't be able to pin them in one place and focus their attacks.
And yet, the distance was just enough for them to intervene in one another's fight, providing support to anyone who needed it the most.
Eren had long come to accept the way people on Labh Salem did things, which was a lot different from the party-based system of Anfang. People in Labh Salem fought their own battles without there being a specific role for anyone in their groups.
For example, people in Labh Salem didn't care that they did not have someone with a focus on healing-typer powers in their groups. The roles of Rangers, close-combat personnel, mid-range fighters, and Tanks weren't predefined from the start either. Needless to say, the presence of a Historian in a group was a foreign concept to Salemians.