Possible glitch/ Cause of mass lag

I don't know if the problem is fixed or not, I have not tried, But an air bender(s) who uses Air Swipe on a large area of grass causes mass lag, sometimes even getting the server to stop and start again. I am aware of that the server lag's a little from time to time on it's own, however if it restarts or stops for all users, then either the glitch has been done or the someone is restarting the server. I also have a few theories of possible lag spikes, but I won't discuss this on here because I don't want other bender's trying it.