'Game of Thrones' season 8 makes us wonder if Bran Stark really is the Lord of the Light
Bran Stark was the one who handed the dagger to Arya and yet during the entire battle he took a back seat and remained in Godswood while the rest of the army was at war.
Bran Stark (Isaac Hempstead Wright) placed himself as the perfect bait to lure the Night King into his trap. In Episode 2 of 'Game of Thrones' Season 8, Bran declared that the Night King was coming for him since he was the last living memory of humankind, something that the Night King wanted to erase. As a result, while the rest of the army fought against the White Walkers, Bran patiently awaited the arrival of the Night King. It wasn't too long however that he entered Godswood and managed to kill Theon Greyjoy (Alfie Allen) who was protecting Bran against the rest of the White Walkers.
However, the moment the Night King met Bran and was about to take out his sword, Arya sneaked from behind and struck a dagger into the Night King's heart, thus killing him. It is the same dagger which Bran had given to Arya under the weirwood tree in Godswood when they reunited in Season 7. Bran explained to Arya, it was the same dagger which was sent by someone "very rich" to kill him right after he was thrown off the tower. As Arya tried to let Bran keep the dagger, since it was made of Valerian Steel, Bran told her that it would of now good use to him since he is a cripple.
Arya, confused, takes the dagger, and after that, we don't really hear anyone mention it much. However, in the final scene of Episode 3 when Arya attacks the Night King, we see her stabbing him with the same Valerian Steel dagger which Bran had given her. Does this mean Bran always knew how things would turn out? He certainly was the one who knew how the Night King would attack them, and when, but this actually confirms that Bran might be the one who knew all along who Azor Ahai was. While everyone, including Melisandre, thought that the promised warrior would be either Daenerys or Jon, no one really thought it would be Arya.
However, Bran giving that Valerian Steel to Arya might indicate that he always knew who Azor Ahai really was and this once again puts up the question if Bran really is the Lord of the Light. By now it is clear that the Night King is the "Great Other" who has always opposed the Lord of the Light. The Night King was coming to kill Bran who is the last living memory of humankind and by killing Bran it would be easier for him to wash out the rest of the human population. Hence, it is not like Bran did nothing throughout the battle. He is after all the Three-Eyed Raven, the one who is always everywhere and sees everything. It would have been pointless to make him go to the battlefield since he would die within seconds, but by giving that dagger to Arya, Bran had already forged the scheme to kill the Night King.
Episode 4 of 'Game of Thrones' Season 8 returns to HBO on May 5.