Based on the outcome it seems to me that blissful ignorance was the best course in this case. Focus (and attempting to take evasive action) would have more likely gotten him killed.
I wonder if you'd even have time to try an evasive maneuver? And in a situation like that, do jut automatically take a dump in your shorts, or do you have to be able to think consciously about the danger you're in and only THEN can you cr@p yourself?