Bug ? DK skills bug?

So I've reached lvl 49 and unlocked the last BATTLE FRENZY sub-skill (Inspiring Presence), but it only increases my max HP and doesn't regenerate anything. Someone said that it actually regenerates the HP too, is that true?
Condemn and Invigorating Anger sub-skills seem to work.
Actually... is the taunt sign from Condemn visible only for a fraction of a second? Shouldn't it be visible for those whole 10 seconds?
... Invigorating Anger? Pfff, useless, Mighty Wild Swing does a better job and it's a wiser choice to use rage on.

And also... Sometimes Banner of War doesn't work, it uses the rage and sticks a banner into the ground for a moment, but it's gray-ish and has no flames and functionality.

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Another thing...

I have about 1 day left of my Tome of Insight and around 4 segments of experience (40%) left till lvl 50, so what should I be killing for a faster evolution? (I actually want to reach 50 before it ends.) Guardians? If so... which ones?

 

I suggest you check out this thread.

For battle frenzy, it's a group / crowd control skill - the important thing about Inspiring Presence is that it increases the (maximum) HP of all group members in range as well.
The healing by Invigorating Anger is minor, but can still help against constant low damage, e.g. when attacked by hordes of mobs or standing in a puddle of poison...