The mounted units would react before the archers, even though Peregan had the trait which allows archers to fire first.
Good catch, i haven't seen it and have played Peregan several times.
One other thing about the automatic firing first, the archers seem to use a special ability. Not very keen on this, since it is AI controlled.
Yup; seen this and do not like it, would much rather they just take a normal shot.