[semlar]

I'm trying to decide how best to determine that the people in the raid are also in the current boss fight and not outside the instance.

You could loop over the raid on ENCOUNTER_START and put everyone who's in the same zone as you into a table to reference throughout the fight, or you could compare their zone (from GetRaidRosterInfo) to yours when they're resurrected.. but I'm not sure if phasing could potentially cause problems with that.

I was thinking something like this..

for i = 1, GetNumGroupMembers() do
    local name, _, _, _, _, class, zone, online, isDead, _, _, role = GetRaidRosterInfo(i)
    if zone == OurZone and online then
        if not isDead and WhoDead[name] then -- unit no longer dead, presumed rezzed
            WhoDead[name] = nil
            NumRezzed = NumRezzed + 1
        elseif isDead and not WhoDead[name] then -- someone died
            WhoDead[name] = true
        end
    end
end