Originally posted by E-Zekiel:
There is, by stunning them. I don't know why some people have such issue with it. It was waaaaaaaay harder to pull off at the start of beta.
AS A NOTE, stuns can be countered, so if you're very obvious with your stun attempt, as in whoever you are stunning is expecting it, they can counter it. Generally, however, if you catch them when they don't expect it, they simply do not have enough time to respond with a counter.
Stuns from behind also seem to have a much smaller counter window, though both are very tiny.