That's part of my point. I don't know what the hell is on the other side so I can't tell you what it's like. I'm opening a Way and it might drop us over a thousand foot cliff, or into a pool of acidic water, or right into a rockface where we'll be immediately crushed to death.
Which is why I'm stepping through first.
You bring up the rear and make sure whatever follows on the other side doesn't surprise us from behind.