Fairy Tail S02E17 - From Pegasus to Fairies

As Zero fires on Cait Shelter, Blue Pegasus's ship Christina, held together by Lyon, Sherry, and Ren, destroy one of Nirvana's legs and cause it to miss. Hibiki relays the details of the plan to stop Nirvana: within 20 minutes, the six legs of Nirvana must be destroyed at the same time.