A Scene in the Movie "The Others." (Open Spoilers)

OPEN SPOILERS FOR THE OTHERS FOLLOW. YOU HAVE BEEN WARNED!

Anyway, there’s a scene where Nicholas and Anne are lying in bed and Anne is trying to convince Nicholas that there’s a boy named Victor in the room. Nicholas is, of course, not interested in hearing this and is terrified, begging Anne to leave him alone. Anne then proceeds to have a conversation with Victor. I think.

I can’t tell if the conversation is the actress playing Anne doing both voices, or if the actor who plays Victor is actually doing his own voicework in that scene. The director deliberately left it ambiguous, IMHO for dramtic effect. The subtitles attribute the voice to VICTOR (as opposed to ANNE PRETENDING TO BE VICTOR.)

Can anyone clarify if the the voice of Victor in that scene was actually Alekina Mann (the actress who played Anne) or Whatzhisname (the actor who played Victor)?