If he had just thrown it straight down it would have been intentional grounding for 5 yards and a loss of down. He needed to throw it toward Olave's feet in order to not get flagged. In hindsight that is preferable but most tips happen when the defender is on the other side of a lineman, not by a lineman in your face or when you're trying to kill the play into the ground. If he had another second, that play doesn't turn out that way, but Judon came at him unblocked.