Donald's lead went to three when Rose went over the second green as the wind died, and failed to get up and down.
Those who thought Donald would pull away were in for a surprise. Rose birdied the third and fourth and was level because the World Number Two three-putted the fourth for a bogey six.
They were ten under par, two ahead of Peter Lawrie and Paul Lawrie, who eagled the fourth and made a seven footer on the sixth.
Donald missed a five foot birdie chance on the short fifth, but made amends from 14 feet at the next and moved one in front again.