system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] What would happen if you threw a blanket over a Weeping Angel?

You can't technically "see" it, at least not directly.  Could it move if you were looking at the blanket?
gpt
You technically aren't seeing one recorded on film either, but it still stops moving when you view the image of it. Being 'observed' and 'seeing' something are different, even if it has a sheet on it, you are still observing it.