I am no expert but, it seems he is waiting way to late to commit to his merge. So late that he pushing his nose down so hard that his tail is coming up in the air, giving the con a bigger target to take the snapshot at. Instead of being horizontal and making the target as small as possible, he is pointing his nose down and leaving his plane in the vertical, leaving a bigger target for the snapshot.
Wise person told me once, you always need to be out infront of your plane... not in it.
Just my two cents.
Stream14