"Why didn't they request authorisation as soon as CSZ saw what was going on?"
This is because they don't deal with simple revenge, so they had to know not just that it's supernatural (which they knew after CSZ's visit), but also that innocent people are being targeted (which they only found out now). But still, they could have come earlier in the morning.
"(IIRC there's a bit later about what ZYL can see on SW with his third eye open - maybe there'll be an explanation there for why he didn't notice anything off earlier?)"
That's his heavenly eye, not his third eye. :) His third eye is always open.
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This is because they don't deal with simple revenge, so they had to know not just that it's supernatural (which they knew after CSZ's visit), but also that innocent people are being targeted (which they only found out now). But still, they could have come earlier in the morning.
"(IIRC there's a bit later about what ZYL can see on SW with his third eye open - maybe there'll be an explanation there for why he didn't notice anything off earlier?)"
That's his heavenly eye, not his third eye. :) His third eye is always open.