LS - Indeed. One of the problems with IR Jammers and IR Suppression Systems is that it's hard to convince beancounters of their worth as you never know how many shots they've prevented. The Time to Impact is a critical feature of MWS design and, believe me, in Auto they can react in plenty of time to either deploy Flares or to point a DIRCM.
Dynamics,
Maybe well trained, or possibly the Mx only achieved a good lock when the aircraft turned away. It does look like a SA-18, but even a fairly swept up system like that will sometimes have issues with clutter in the seeker head FoR.