SO yin:

Dangerzone II: Can be activated if one of two conditions are met in 1v1s:
1. You are down by a ratio of losses that means the next loss will cost the RPB.

2. You are outrpl'd by at least 30 rpl in total.

In group fights, however it has a slightly different set of rules:
1. If the group you are against either: out rpls you by 150 rpl, or the numbers of their group outscales you by a ratio of at least 2:1.

2.
a. Your party loses the first round of a 3+ round 'group rpb' with at least 2 members of the other group still standing.

b. You are the last member standing after round 1 in a victory with no more than 33% hp remaining

c. You were Ko'd first and the rest of your team went down within a 10 second count down of ko.