User blog comment:Morganaforever/Series 4 Modifications(IMPORTANT!)/@comment-4190137-20120214104845/@comment-4650675-20120215120934

I'm really sorry for not answering immediately, I just thought it was a rhetorical question. You must mean 1.26, because that's when Merlin gets tackled. It looks like it's Arthur tackling him, or perhaps Lancelot before sacrificing himself. It must have been on the Isle of the Blessed. My speculation is that the island started perishing after Lancelot's sacrifice and Arthur woke up, so he and Merlin ran away from it. The reason it got deleted should have been that the place will be used in the next season again so the writers changed their mind in having the isle of the blessed destroyed. Then again maybe Lancelot pushed Merlin aside in order to avoid an attack from the Caileach. Either way, it's definitely one of the knights tackling Merlin on the Isle of the Blessed.