There are some weird fudgers on this forum
Probably was in shock, and since you were there it opted to stay very still hoping you wouldnt notice it or kill it.
Just an last resort to try and stay alive when it cant fight
Funny thing with critters like that, they can't percieve that we are just curious. Its 'Oh, brick im fudged' if we get closer, so i can't even imagine the stress we put them through