There is a cavity between the slave and motor oil that has a weep (drain) hole. if either seal would fail the leaking fluid would drain out the hole unless it is plugged. Not likely but possible.Done, did not realize the seal was so rugged not to tear.
This got started because the clutch went out last Saturday. There did not seem to be anything wrong with the clutch handle mechanism. I am waiting on a slave cylinder kit as I have read that it is possible for the fluid to get past the oil seal and mix with engine oil at the slave cylinder, not good. Changing oil now just in case.