The Incpector has gathered all his clues and has come to a conclusion , as they se the flash backs they will understand how her friend got killed
Incpector- So the assassin entered while you were out sometime yesterday. He placed a block of ice to sustain the window and started the air conditioner to avoid the ice from melting.then he emptied the glass of water for we to think that the puddle of water was from that glass.
Incpector- Then he left and got to the front building to take the shot. The Assassin runs up the stairs, takes his weapon and aims it.At the building in front of the hotel
Inspector - your friend came in feeling ill as you said and went directly to the bathroom.
Inspector - ignoring the ice in the window, she felt cold and went to the air conditioner to turn it off.
Inspector - And then she went to the desk to sit or rest.