Since other folks clarified that the suit needs to be about patents that are claimed to be essential for implementing W3C specifications, it just remains to fill out point 1 and swap A and B in your point 4:
1. Entities A, B
4. B sues A on a related matter, for example they claim a patent on some essential W3C technology
As a result:
5. A sends B their new license terms for the assorted patents they hold, plus a request for prompt payment of fees or removal of product from distribution
6. B considers whether they can pass this cost on to their customers and still remain competitive with C..Z who still get A's patent claims royalty free.
In English, every word can be verbed. Would that it were so in our programming languages.