Poor Tyrion. He is standing on a hill just a short distance away when Jaime goes into the water. If he does nothing to prevent his brother's death, the weight on his heart will be immense. It could be enough to force him to reevaluate where his loyalties lie. While he will never side with Cersei, he may begin to question Daenerys's methods. Even though he understands the costs of war, losing his brother — the one person who always protects him — could very well push him to reconsider his role as Daenerys's Hand. After all, Tyrion has ruling experience as well, and with Varys's allegiance to the Dragon Queen already wavering, Tyrion may conspire with the Spider to put someone else on the Iron Throne entirely. Like Jon Snow, perhaps?
One thing is certain: with Jaime no longer in the picture to act as a buffer, a showdown between Tyrion and his sister would be imminent.
