Talk:Warrior's Grip/@comment-25599916-20150213141226/@comment-26114734-20150227013411

Read it a bit more carefully. It's "+20% Parry Damage to Stamina." In other words, parrying while channeling (or blocking if you'd rather) will consume 20% less stamina than it normally would. While it makes channeling costs really high, you don't actually consume channeling energy while blocking. The only time the channeling efficiency comes into play is for channeled attacks.