If your link drops in a particular way, the mud doesn't realize that you've actually dropped link. As far as we can tell, you just left the keyboard. No trueblooded pk'er would ever do that with a pkable character online, but we're not going to make assumptions about it.

As far as the other character knows, you might have been spamming something they can't see you doing, trying to type commands but misspelling them, or even just can't figure out what to do in the fight. They have no way of knowing that your nonresponsiveness is due to a link loss instead of something else, either.