The last lantern

The first boat rests alongside the broad sill of the rear landing window. Water outside is just below the upper floor. Pavel and the seamstress help the boy sit on the sill; Ronald receives him into the boat. Yakov keeps the boat in position. Karen remains seated to balance it. This is a single controlled transfer, not a leap.
Ronald: I've got you.

The seamstress joins the boy in the first boat. She stays close to him. The injured lodger remains seated inside with Pavel, clearly visible behind them.
Seamstress: There's still a man inside. The other boat is coming for him.

First boat passes back through the arch with Yakov, Ronald, Karen, the seamstress, the boy and Tony. The second boat waits until its way is clear. The stone joint used as the water-level reference is now submerged.

Harly notices that change from the waiting second boat and points it out to the boatwoman. Anya looks towards the rear landing, where Pavel's lantern is visible.
Harly: That mark was above the water when we arrived.

Yakov brings the first boat clear of the passage and calls to the second boatwoman. The first crew remains nearby in sight of the entrance, rather than heading off to the shelter.
Yakov: Bring them straight out. I'll wait here.