If Ryanair don't like Norwegian pinching their pilots, they need to muscle in on Norwegian's core multi frequency...
If Ryanair don't like Norwegian pinching their pilots, they need to increase the pilots terms and conditions above that of Norwegian, and treat pilots with respect. Simple. Note that despite all the negative publicity around the pilot shortage Ryanair have not increased the T&Cs at all, and experienced pilots and staff will continue to leave from all departments