I think two directed kills is too much - too powerful for a small tech slot, even if it's only at death.
I agree the second kill being random ends up being too random. How about it just being a single kill thing? Like it works at night: kills your killer, and that's it... Makes it weaker rather than stronger, but it's a last ditch thing anyway.
...perhaps make a special case exception: if there are only two other people alive, it kills both; so, still not random, and works exactly like today in the case the game ends with an Ext + 2 townies, the Ext still can win a scorched Earth victory.
Other possibilities: it hits the first and last person to vote him (still seems too powerful); or it hits the last person voting him, and one random person from three of the alien's choice (so it's less random, but still a bit, like aiming at a crowd at long range - he picks three, one of those three dies)...
Edited to add: another possibility: kills the last person to vote the alien, and the last person voting that person (target). Would still make it nonrandom while less deterministic, would match the flavour ("someone standing close to them"), and if no one is voting the target, only one dies. Balances out nicely perhaps.
PPE: Ninja'd by Jim. I still think two deaths deterministically is much too powerful, and gives it unwarranted deterrent power.
On other things, two things came to mind reading the game PMs and post-game chat:
a) I'm not sure it's clear if I have a mindshield whether I know someone attempted to block me and failed because of it. Also speaking of flavour, I was blocked by a warden but no chains (but Meph clarified over PM that this was an accident, so no big deal).
b) Toaster mentioned the replicator can't be used during the day? I think this is not optimal. Given the stated purpose of the replicator ("Allows the Alien more flexibility to respond to changing situations"), I think it should be a free action at any time. I could decide to make two small techs immediately on D1, or hold my last replicator juice to use only if it looks like I'm going to get lynched (so Toaster could have made a stun orb last day if it looked like he would survive, and a bomb otherwise). Also, can it be used to make two identical items? Say two shields, or one shield N1 and another N2? If so, what happens if I make two deadman bombs and they explode at the same time? That sounds really cool.