I listened to Kaas for about half an hour and IMO he isn't a fallen.
He is active and does a good amount of loggings (Like 130 in 212th)
I am happy (at time of writing this) for Kaas to enter Batt
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I saw you shooting him then get to low hp and then proceed to kill yourself with the intention of causing as much damage as possible with the last little bit of health you had left. Classic 212th Suicide