The Spinnaker (or as some players call it, the Hairdryer, Haze Cannon or the Haze Spewer) spews haze in one direction, leaving its backside vulnerable. Each time it takes damage it it will spin around, swapping the position of its attacking side and weak side. The easiest way to kill one is generally to attack it from below, or to alternate attacks from both sides with a co-op partner.