[Rules] Activating units outside of an Assault to move on a IF

[Schoenwulf]

Especially the 1st sentence of 12.51. "Only leaders in the assault hex may influence units there"; but one does have to read down to see the ambiguous "Leaders in the assault hex may direct units in adjacent hexes to enter the assault hex, but may not influence them in any other way if they don't enter the assault hex."
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That's the way that I've played it, activating the stack and having the leader mobilize the external unit. Doing one unit at a time, first the DM unit that flees, then the adjacent unit enters and becomes a member of the assault pack. I agree with others that this is one of the few times that recovery is not wanted!