Fear now sends Master Yi running away from the caster. If Master Yi is feared during his ulti, he will run away from the caster at full speed. This is a very good thing for Yi if he is attacked, say by FS, as he will run outside the range of FS abilities really fast. On the other hand, if he is attacking FS he will run away from FS also realy fast.
I think this should be added to the wiki.