Luka did the same thing when she finally figured out the spiral staircase.
At first, she would NOT go down the staircase further than a couple of steps.
I encouraged her, put food on the steps, etc... no way was she going down there.
Finally, I picked up her feet and placed them, one by one, down each step, sort of pulling her along kicking and screaming.
She made it down the steps, and was SO happy that she was still alive, she did this little dance at the bottom, then we went back up the steps, and back down, this time she did not hesitate. Then she was so pleased with herself, she started running up and down the steps by herself.
It was really cute. She still loves going down to the basement just for the heck of it... also we keep the cats' litter boxes down there, so there's usually a wonderful reward awaiting.