He interpreted the repetitive 'salam aleikum' as spamming voicechat.
Reason 'bled' is because the name of the one he gagged is Suka Bled and the command goes
So instead of writing !gag suka Micspam he wrote !gag suka bled micspam.
He gagged too quickly, granted, but I suggest you show a little tolerance from your side as he is a new staffmember. I'd expect an SA to understand this...