I want a person to pass out on my adventure map but he sees too much

I am making an adventure map and I want a person to pass out on the ship and not see anything at all, at that moment the chat says what just happened but when i do /effect @a minecraft:blindness 255 20 (correct amount of time) they can see blocks around them. But during the time they read the chat they are teleported to a different area. Any ideas or what I should do?
Best Answer
You cloud try running a command to teleport them to a room made completely out of black blocks, or the floor they're on and coal blocks all around them, then teleport them back when needed.
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