diamonds just mean most dangerous contact, not necessarily that it’s targeting you.
you can guarantee though that if you see 10 on the RWR for more than 5 seconds and you are within ~50nm you should be heading for the dirt regardless. you have to treat the system like an AMRAAM essentially: if it can fire on you, assume it already has and start your defense, which in this case means running for the deck, the hills, or both.