Why was the woman worried?

M: Hello! You seem worried. Can I help you ?
F:  Oh, I feel so strange with my feet in the skis.
M: So you don’ t know how to ski. Is it the first time you come here skiing?
F:  It’ s even the first time I see the real white snow.
M: No kidding! Where are you from, young lady?
F:  My family and I live in Hainan Province, China. We do not have snow in winter. It’s always sunshine.
M: No wonder. I guess you must be a good swimmer, then.
F:  You are right. Swimming is my favorite hobby. But I simply don’ t know what to do with these skis.
M: Don’ t worry. I’m sure you will learn it very soon. Now walk as I do, all right? Good! Let’s go up the hill and try once, shall we? When you want to go up the slope, you should stand sideways and go up step by step, just like a crab.
F: Oh, it’ s really funny. I’ve never walked in this way, but it’ s interesting.
M: Let’s move to the gentle slope, shall we? It will make things easier.
F:  I guess I’m a little nervous.
M: Take it easy. Trust yourself. Now, keeping leaning forward while going down. Remember the tips mustn’t cross or you’ll fall down. ff you want to stop, you should point the tips together, got it?
F:  I see.
M: Now, let’s try. Okay, Go!... How do you feel ? still afraid?
F:  No, not at all. As a matter of fact, feel quite pleased and proud of myself, thank you. You are so very kind.