Ultra give us 2 different attacks, i think. Look at "distance" parameter.
"In square 0253 one T5B miss at group of 2 large patrolling vessels (speed 7, inclination 90, distance 60, depth 3) and one at large patrolling vessel (speed 7, inclination 180, distance 20, depth 3).
DEFE 3/523, page 599