main quest lvl 69

Hi,

I'm stuck at this main quest in Siberia where the pnj int he fortress tells you to meet him, but when i'm near him, he disappears and I get a quest fail.
I've tried every way and every time it fails.
Please Help.
Thanks

screen?

there:

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You have to follow closely a girl that shows up after this conversation to her destination. If you let her get too far from you, the quest fails. As far as I remember, that's it.

thank you so much it worked.