against a warrior this could be rly usefull I 99% of them tend to charge in and then run away a little to intercept.. blow your Thunderthingy and wham!! byebye mr warrior

this on the other hand could cause major havoc to a boxer.. I guess it just comes down to being the first to cast it ^^ having a shamy do that in the middle of your group would surely be hell although.. If the shammy attacking you is a muppet ^^ you may get pushed back out of harms way