During the doubles tournament one of our opponents that had a jump pack squad (with the hit and run USR) used it even though he was not engaged with anyone (his squad had made a normal move and was totally unengaged). This got him very close to our rear line in one turn.
I always assumed that the hit and run rule was specifically for letting units LEAVE COMBAT if they were engaged, and was not just a free "bonus move" like Eldar jetbikes.
I guess the question is "was this legal?" Can the hit and run USR be used a free "bonus move" if the unit is/was not engaged in any combat to actually "hit and run" away from?