How to kill King Radovid in "Reason of State"?

In Witcher 3 I'm at what seems to be a dead end. After Radovid told his men to kill Geralt, I pursued him and he is now in a fenced area, alone. My objective: kill Radovid.
Alas, there is no way to get into this fenced area. All I managed in 15 minutes of trying was to get on top of the fence, but I cannot cross to the other side.
What am I missing? What am I supposed to do? How can I get to Radovid from there?
NB: I also tried Aard and Igni in the hope to destroy the fence.
Best Answer
Deltharis was mostly right, although it took me some time to understand the exact meaning. I'll accept his answer, but want to outline what seems to have happened. I tried this both with patch 1.04 and 1.05 - this particular thing is clearly not addressed by the patch.
I loaded an older savegame right at the point when the Redanians attack Geralt by the king's order.
Problem is that at the blockade there is a Redanian soldier that is not aggressive towards Geralt until you provoke him. It's the same soldier that I couldn't kill after the cutscene in which Roche joins Geralt after the king gave the order and Geralt fought off the first enemies.
If you manage to kill that Redanian soldier before the cutscene with Roche, you simply proceed crossing the bridge. At the other end, and after killing all enemies in the way (there are none in the smaller streets), you will see another cutscene, which allows to progress further in the quest.
There is one thing that I only noticed after retrying as described above. The first time around, when I didn't get the second cutscene at the temple isle end of the bridge, there were witch hunters standing around idly along with Roche, Ves and Geralt. Those didn't stand around anymore when I got it right - they had to be fought on the way to the king.
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How do I trigger the quest to kill Radovid?
You have to do a series of lengthy side quests to trigger the "Reason of State" side quest at the very end of the game. During "Reason of State" you will then automatically assassinate King Radovid as part of the quest.Can you kill King Radovid?
If you choose not to help kill Radovid, or you side with Sigismun Djikstra, then the empire will lose the war and be overthrown. If instead you do help kill of Radovid and you side with Vernon Roche in Reason of State then Nilfgaard will conquer the north.Can I kill Radovid and Dijkstra?
However, it's also important to save the mages in Novigrad, to help kill Radovid, and finally - to side with Vernon Roche and kill Dijkstra. If the player doesn't do any of these things, Radovid will win and Ciri will become a witcher instead.The Witcher 3 ► King Radovid's Assassination, Dijkstra Dies - Reason of State #169
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Answer 2
I know its late but if anyone new is experiencing this reload the last save, youre glitched. Happened to me.
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