guess they locked themselves in to prevent the spread- assuming it came from there, and they were already afflicted. And maybe Saladin wasn't afflicted and they wanted to spare him against his will, or he's just lazy af and spent too long flailing at space aids to follow
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I assumed he was busy killing a few swarms that escaped (kill it with fire!!!) and they locked him out as there was no time to wait for him. In the trailer it looks like there is red slime in the crack of the door, like SIVA realized they were locking it in, dove at the door, and just barely got crushed inside the crack. Waiting for Saladin would have let SIVA go free. What really made me wonder was why Jolder stayed inside the door. She had plenty of time to step through as it was closing, then we would at least have two iron lords. I like your idea of her knowing she was already infected, so she couldn't leave. My last question is why Saladin tried so hard to be locked in with them.
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Survivors guilt and feeling like he belonged to sacrifice himself alongside fellow iron lords. It's actually pretty sad when you think about it.