It's a 6 man rush with a MLB spy for the back who leaks out, that means it's singled up in the secondary. Any good QB could recognize that, and it's clear Copeland was his #2 read. Look at the other views of the play, once he spots Copeland beat his man his eyes only leave him to spin out before locking back on. Very little risk in that throw in a one on one situation for an accurate QB throwing to a receiver with a step on the DB.