snape faces narcissa. bellatrix, hand faintly trembling, places the tip of her wand over their linked hands.
dumbledore leads harry up a steep narrow street lined with darkened houses.
harry follows dumbledore around the rim of the lake. in the center, a greenish glow shimmers in the mist.
dumbledore leads harry on. stops. takes a step back. he closes his eyes and to harry's horror walks right to the lake's edge. as the dark water laps over the toes of his shoes, dumbledore passes his hand slowly through the air, then closes it.  as if gripping something invisible. taking his wand, he gives his clenched fist a tap and a thick coppery-green chain appears out of thin air, extending from the water to dumbledore's hand.
in eerie silence, the boat cleaves the water, ferrying harry and dumbledore toward the greenish glow.