User blog comment:Paamanking/Garen's Passive during a Clash/@comment-70.233.74.171-20130111174018

His passive is intended to a be a laning tool. Hp5 isn't helpful later on when its teamfights because unless you're regenerating large chunks of health (volibear/mundo) its almost insignificant relative to the numbers of damage being pissed out by enemy champions. You really think your 43 Hp/sec is going to help when the enemy carry is critting you for 500 on a bad day? Garen's passive isn't a combat passive, thats why it turns off in combat.