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I'm not familiar with eldar, but assuming that he is attached to the squad he will flee with the rest of the unit. As is stated on p. 50 in the BGB.
"The ones with lingon och skit" - Andusciassus
Further, if the unit is below 50%, he will never be able to leave the fleeing unit, as they can't rally.
So he's stuck running with the unit as they zoom off table.
Except if you pass near an Avatar.
16,000+ of Eldar (only need flyers)
7,000+ of Nids (want heirophant)
6,000+ of Space Marines (need rever titan)
4,400+ of Cygnar (all models for the faction)
1,500+ of Legion (just started)