It is. I don't know if any of what I've found is useful. It relies on the theory that the aliens can manipulate their hosts' actions, but I'm not sure they can. If they can't, there's truly no way to be sure.
...Well. There is one way. Elizabeth acted as soon as she learned of Hancock's role. They're hostile to the third parties. I'd felt certain Bull was not one, as he had a different role to play. Now, I feel rather persuaded I am not one. I knew his role for weeks, and didn't harm him, though I could have done so easily. Arguably, perhaps a parasite in me decided to let Bull's murder play out. But I should note that it is for this reason I had nothing to do with the selection of the victim; it would have been too easy for a parasite to manipulate. And in the end, he would have gotten away with it and resigned all too easily, had he not decided otherwise.
no subject
...Well. There is one way. Elizabeth acted as soon as she learned of Hancock's role. They're hostile to the third parties. I'd felt certain Bull was not one, as he had a different role to play. Now, I feel rather persuaded I am not one. I knew his role for weeks, and didn't harm him, though I could have done so easily. Arguably, perhaps a parasite in me decided to let Bull's murder play out. But I should note that it is for this reason I had nothing to do with the selection of the victim; it would have been too easy for a parasite to manipulate. And in the end, he would have gotten away with it and resigned all too easily, had he not decided otherwise.