The ending got really dark, really quickly, but this is what I got out of it: It's heavily implied that the writer thinks Mayumi was telling the truth in her w

The ending got really dark, really quickly, but this is what I got out of it: It's heavily implied that the writer thinks Mayumi was telling the truth in her written account, despite what she and Richard said when they called back: that Richard asked Falcon to hide in the basement, and when he wasn't down there, they were legitimately concerned that he could have actually been in the balloon.