XOR, nice link to taugrim, he's one of my favorite PVP sources
Hmmm, so the safe login doesn't have a zone attached, but you're not suggesting that it does. So let me rephrase and see if I understand: Your idea is to look for <safe login> <bolster> death, then rezone in would look like : <safe login><bolster> repeat. repeat, repeat... until we see <safe login> and no bolster. Is that correct?
Now it makes sense why you said there appears to be a bolster event in level 50 only warzones.