Well, the Tengu had been watching the MC since the start of the manga, given creepy eyes and noises, just like the Stalker. But I think there's some element of willingness on the part of those disappeared. The Editor's friend expressed some element of hopefulness that the Tengu's Marriage was a happy one just before she was grabbed. The Stalker was returned, after a fashion, and was left dismantled as a gift for the MC. The Tengu did try to grab the MC when it'd be easier, but let go because there was no element of choice or willingness on her part, no matter how misread?
But this manga is really good with the details. I noticed the tree's branches being cut on my first read-through, but didn't notice how the Stalker tested the branch's durability right in front of the MC the first time she invited him over. I'm fairly confident that the Stalker delivered all the gifts up until the reveal.
The Editor also seems to know all the signs, so it feels likely that her friend had been watched by the Tengu for a while and she had been making note before her friend disappeared.
What bothers me most is that the Tengu appears to be crying in the 3rd image of its face, as its extending its hand/proboscis. This manga has Details, man, and that is throwing me. I don't think it's from the stress of shooting out its grabber, it does it too quickly most of the time.
This is a 44-page story and there's so much to take away from it!