It was garrosh's exposition during fogs of pandaria to Burning Crusade Classic Gold the sha gods of evil that drove him insane and gave him that huge terrifying troll physique. In the beginning, even in the Icecrown Rally, you can observe garrosh's lesser stature and that thrall was larger than him. He also joined the iron horde and was strengthened by the iron horde.

I'm sure he worked to the max with his "real iron gangsta bros" as he grew larger and more powerful.

It is also my opinion that thrall was holding back throughout the entire battle because internally he felt that he was at fault. He believed that all the way till he has the conversation with his mother in Korthia.

Garrosh knew he needed to be killed, but only as an last resort. He could have cut off his head, cut him with an axe severely punched him with the dooms hammer or cut off his head with a sharp knife. However, it might feel too primitive. He opted for the electric chair option and was able to be executed using just one lightning bolt. I'm assuming that the death was rather painless to garrosh. He is struck by lightning and immediately is unable to sense.

What I'm trying convey is that the warrior in thrall didn't have the ability to kill him. Garrosh would have died a much more painful and violent death. Honor is the right of the warrior. The shaman is the wild one. The elements are wilder and uncontrolled. They can be pushed or pulled and will destroy you almost instantly.

It's also possible that thrall lost his warrior skills due to a lack of experience as he mainly uses his shaman talents since the war ended using archimonde Warcraft 3. Perhaps thrall is less skilled as a warrior since that time. With the dragora in his hands, he is more warrior like and present day thrall could possibly kill the makgora day garrosh using an axe "for Azeroth!" Like He did to Helya!

In fact, even though Thrall killed Garrosh by using his shamanistic powers, he was still feeling guilty about how he dealt with it and how Garrosh came out because of Thrall's decisions and all that led to him losing his power.

Are they really unable to summon earth bridges? The earth bridges he summons are in legion, and in the sanctum de dominion. It's probably more about him not using the powers he had to take out garrosh.

He does feel guilty however he's not embarrassed. When talking to drake he mentions it to her in korthia. She assures him that buy WOW TBC Gold it isn't his blame.