How to stopp my opponent to cause lag in arena?Follow

It happens many times to me in an arena fight that I got strange lag (1 sec or 2) in the moment I would fish my opponent. What I can do against this? I believe that this is not happening by accident…

Last time it happens in a fight my Druid against rouge. The rogue used already his trinkets and was nearly to die in 1 sec. And then the whole screen lagged for 2 sec and ofc the rogue survived cuz of that.