I feel he was rulebreaking either way you look at it in the first clip. If the Engineer wasn't KOS, he did freekill. If the Engineer WAS KOS, he willingly gave LR to a rebeller for a stupid reason (a bad mic).
Accepted, thanks for the report.
EDIT: He is perma-teambanned for an MFK from a previous report, so I can only assume this occurred before the teamban was applied. The mute will be applied for encouraging rulebreaking.