Jon giving Littlefinger the long finger and heading south makes me think he's going to die at the end of the season.
Again.

Daenerys can't siege King's Landing without a fleet so that plan is dead and since the sand snakes are dead, Dorne probably won't aid her now, there's no one left there.
She has little choice but to attack King's landing now and they showed that they have ballistae that can probably kill dragons.

Feels like they were foreshadowing their downfall in this ep.

We had a team-building game at work in which we had to make a marshmallow launcher with some sticks and shit.

The winning team made a crossbow named "Dragonslayer"