Talk:Fall 2015 Event/@comment-26158347-20151123030313/@comment-3502824-20151123042904

Basically if you didn't clear E-4, you could have made the Boss stuck at below 25% HP Bar to have it become Final Formation, which would have changed other nodes as well, especially node M which would have been locked as Anchorage Water Demon III as flagship with Elite Wa-class Transports, which is one of the 1/2 formation to give you Prinz.

Since you cleared E-4, the factor above is now gone, and you now have 1/3 chance to face an enemy fleet in node M which won't give you Prinz AT ALL.