Cut to Trystane's back, revealing a vial hidden behind one of Trystane's daggers, as he lunges with his dagger he throws it. Bronn being Bronn, blocks it. It shatters and the poison inside misses Bronn and hits Myrcella in the face. Myrcella screams.
Trystane and Jamie: Myrcella!
Bronn: (knocks out Trystane again) Fucking dornish. Dagger and poison in their tits.
Jamie: (he's ripped off a piece of his clothing and is wiping the poison off his daughter's face. He looks at Trystane) What are you waiting for? Finish him!
Bronn: Killing Martells hasn't exactly worked out for your family. We leave the boy, take the girl. Dorne is only pissed off instead of fucking pissed off.
Jamie: Fine (he grabs Myrcella).
Mycella No, no! It hurts, it hurts!
Jamie picks up his daughter and both he and Bronn run towards the exit. They open the door and come face to face with a surprised Doran, Ellaria and a dozen Martell spears.
Bronn: Ah, fuck me.
Doran: Where is my son?
Bronn gives Jamie an 'I told you so' look.
Jamie: He's alive, my companion just knocked him out.
Bronn looks at Jamie like he's the biggest ass in the world.
Ellaria: What happened to Myrcella?
Bronn and Jamie stare blankly.
Doran: Arrest them, but not the girl. Ellaria fetch a maester for Myrcella's face.
Ellaria nods and leaves.
Doran: We have much to discuss, you two.
The scene ends with Jamie and Bronn being brought into Martell custody.
That about catches up with the tv show. This version (I think) is a bit more sound and cost effective. Finding an actress who can wield esoteric weapons (like a spear) is difficult, let alone finding two others. Thus, the fight scenes only focus on Obara and more time can be spent polishing them. The other snakes have poison or arrows, which is fairly easy to Hollywood magic. Nym's fight scenes involves only a few movements and throwing knives which, like arrows, are pretty easy to choreograph.
The last scene also leads us into the next plot point where Trystane and co are brought before Doran, Ellaria and Areo, who chastise the group for their foolishness, which accomplished nothing but getting Myrcella scarred. Trystane thinks that both Ellaria and Doran are cowards, who would prefer to bed the lion than to fight him (though, he is still very upset about his betrothed). Doran reveals this is not so. He has been secretly allying himself with the Targaryan cause (which hit a snag when Viserys wed his sister to Khal Drogo and the prince died), but now his sister is widowed, has an army, dragons and needs Dorne's help to win the iron throne. He wants to send the Sand Snakes/Trystane to Mereen with a wedding proposal. You could add some emotion to this scene by having Doran walk to Trystane (the gout makes this excruciating) and hug him, telling his son he believes he can avenge their family. Myrcella doesn't take this news well and slaps Trystane. Myrcella then allies herself with her uncle and Bronn, seeking her own way out of the Water Gardens. As such the Dorne storyline splits into two groups Sand Snakes and Trystane heading to Mereen and Jamie's team trying to flee Doran's court.