This page shows in what ways Feng Mao is weak against GRIM.exe. Or in other words what actions should Feng Mao do to receive minimal damage from GRIM.exe. Note: any hero isn't always strong or weak against another one. It depends on many different factors so please keep that in mind while adding your tip.
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It's pretty easy to block his ULT - you'll get a feel for the timing but a second or so after he locks on, just hit your block and the ULT barely scratches you and you strut off into the sunset like a p!mp