Three things... One, Njoku gets down the field fast. Long strider, but his first few steps are very fast for a tall WR.
Second and third... Donaldson and Gaynor are just looking for people to destroy. It's been a long time since I saw two OL just wanted to take out anyone they possibly can, and violently. Also, Donaldson can flat out move for a guy his size. When was the last time any of you saw a man that big get down the field that fast? McFarland made a huge mistake, because these guys could have gotten him some hardware.