Melis is going to have to turn around out of the library and go with Burn then, I'm guessing. And the two of you will have to lose the Agent that's with Burn. There's no time in which to engage it, though, so you'll have to trick it to get it away.
Hmmm. I think going with my idea of tricking the Agent into thinking you've gone over the balcony will probably work best, just need to actually turn it into a plan.
Okay, I think Burn and I have worked out a plan that will work. Or it should work.
Melis needs to turn around and leave the library, and Burn needs to take advantage of the fact that he's got a short time in which he can get away from the Agent.
So, the idea is for Burn to run like hell to the balcony, and he needs to be able to get there ahead of the Agent. Once there, he's going to toss a grenade and his coat over the balcony, and then hide before the Agent gets in there. With luck the explosion of the grenade will attract the Agent's attention, and seeing Burn's coat will help foster the idea that he went over the balcony, and hopefully the Agent will go down the balcony, thus giving Burn clearance to get to the clock tower.
Meanwhile, it's going to take a bit of time for Melis to get back out of the library and through the study, so she should head through the corridor that leads from the north end of the N/S corridor to the clock tower; if needed, her makeshift staff can be used to block a door.
So...yeah. That's what we've got.
And I have another random idea that decided to hit me as I was about to fall asleep and kept pestering me.
Would be tricky, but feasible I hope.
Mors, may want to pull that rope back up though, just in case...
Anyway. Burn runs to the balcony room and hides there; with any luck the Agent will think he went straight through and will head to the clock room. At that point Burn will need to quickly duck back into the N/S corridor and throw a grenade towards the northern end of it. Then hopefully the Agent will run back out through the corridor that connects the N/S corridor to the clock room, which will give Burn time to get to the Clock Tower.