No log entries suggest he killed you nor that he was the one who destroyed your printers - Accusations in video evidence 1 are not properly underpinned. Insufficient evidence.
[ZARP] lWl Super Golden Sinz (STEAM_0:0:3818233) was killed by Himself with a env_explosion in the Electric District
As for the second video, the admin in question left whilst you were still frozen, which appears to have been an accident rather than an intentional act of misconduct.
Given the lack of supporting log evidence and the peculiar circumstances surrounding the entire situation, there is insufficient basis for any action against the staff member.