Regarding the spoiler... It's the same with Attack on titan episode 5. A lot of people are like: I'm sure he's not dead cause I've seen him on some poster in season 3 or I heard friends talk about him later in the series. When a show is so popular and so long it's impossible not to know stuff like the main characters are still alive later on, but I don't think it ruins the experience that much.
Great reaction guys!