Paranormal Activity at our School? Nah, just ghost

Oh my gosh, while we we're filming for our movie, my friends said that, "They heard something." Like a girl crying.
At first I didn't believe it, I said to them that "Nah, it's only from the camera." So, we decided to record the sound, in tape!

In the right, that is me and in the left, it's my friend. The one who's recording the video was my other friend. And the others are leaning their backs at the door. (Which is, they didn't appear in the video)

Let's watch. After you watch it, be back here at my Journal and read the note below the link.

www.youtube.com/watch?v=0_x1sC…

Now you see? Well, it's not like, "We're entertaining the ghost." I mean, we're silent at that time. No one spoke, only the laughter.
We're not doing this because we want to scare you, we just want you to see what we saw.
I only edited the "audio", because, I want to know what is the real meaning of that sentence.

When I slower down the audio, and adjusting the tempo... this is the word that he/she or whoever said, "Christ".

It may be not spooky to you or you don't believe this, I understand.
I will tell you, all you have heard was true!
No edits, just the audio and tempo.
You might not be scared, but for us, it is!

Especially, this video was taken, Friday the 13th

Thank you for reading my journal...
_{Scaaaaaaaaaaarrryyy! Goose bumps!}

Edit: I don't know if the spirit is Good or bad?

Another Edit: As the others say that they don't think it's "Christ"
Then, we have a 50-50 possibility too,
Even I don't know if it's "Christ" or not.