Boston doesn't need to cross the open field and yes Arnold does drag him across. Why do you think he is running in that direction?
I've marked on the red line where Boston stops and has to change direction. If the pass is thrown as in the image then Drake is gone before Boston can even turn. The deep safety is a million miles away. As is the corner tracking Kirk.
If Kyler throws the underneath to Drake he gets the 1st down and more easily.
Forgetting all that where Murray throws the ball to Kirk on the inside is right where the CB has the advantage. The ball placement should have been deeper and closer to the hashes for Kirk to have the advantage.
The easier deep ball is to Fitz thrown towards the sideline where he has the outside leverage over the DB and Nuk has drawn down the outside CB.
Murray throws that with a little touch and Fitz grabs that all day.
Of all the options available Kirk was the worst one, especially considering where the ball was placed.
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