Proof with trivial.
intros; apply alarm_at_alerting_distance...
Qed.

Theorem ails_alarm_when_conflict :
forall (intr : Trajectory) (evad : EvaderTrajectory) (T : TimeT),
h intr = V ->
h (tr evad) = V ->
(AlertRange < d intr evad)%R ->
conflict intr evad T = true ->
ails_alert (measure2state intr 0) (measure2state (tr evad) 0).