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Comment by soarfourmore

> The would not know at that point whether the CM pilot had his spacesuit helmet on or not, so they wouldn't know until they opened the hatch whether they had just killed him.

There were windows on the command module to look in, and if they weren't sure if he was responsive/unresponsive, they could tap iron onto the command module to let Collins know they were there and spacewalking.

It's an interesting thought process though, and I would appreciate the source if you can find it

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