Master going to the nuke. Literally the episode before he says to quinlan "you think I'm foolish enough to come within range of your bomb", then this episode he goes straight to it, so apparently the master is a bit thick
Occido lumen. So what was the point? Was built up as something dangerous to the master, master wanted it and then it ends with a nuke. Remove the Occido Lumen and nothing would change.
Plan was stupid. Why two lifts? Just have someone waiting down by the nuke. Master and quinlan come down, boom.
Quinlan. For all his big talk throughout the series and hunting the master for years, finally gets his 1v1 and gets battered. Wtf was he doing in all the time he was alive.
Ephraim going to Zach when the master was going to switch hosts. Why? All going to die when the nuke goes off anyway, nuke would save Zach from that fate anyway.
Writers trying to get a little redemption for Zach. Get out of here, he is beyond redemption. At least he died though.