Sentinel has many design problems. The owl likes to go out on your first ability often so if the tank doesnt squat right there boom you lose 25% of your damage. Im also not sure if it has an internal cd seems around 5-7 seconds but if owl comes out at the end of the pull and ur chain pulling ur dps also suffers. Its like Dnd but worse because atleast dks can stand in dnd and still get their cleave without mobs being within the circle but with sentinel the circle is smaller and if mobs are outside of it welp you might as well not have any hero talents.
I think this skill should give you the option of atleast tethering it similiar to how earthquake now has that option.