Cam lobe going flat...what now?

Tell ya what I think. Drove straight home and shut it off. I feel there is a very reasonable expectation your 440 is fine. Maybe just a oil pump. Because a good filter will catch that trash and hold it. Anything small enough to get through is going to be small enough to cause no harm. Especially as quick as you were on it. Thats the way they are designed to work. Now if you cut open that filter and found nothing,then it might be time to start wondering.