At the bottom of the slab he brought up with his foot braced against a knob, and he saw Barbara coming after him.

When she stopped her glance was apologetic.
"I forgot you hadn't proper boots.

Give me your hand and try again." "No, thanks," said Lister.

"Do you think I'm going to let you pull me up ?" "Why not ?" she asked with a twinkle.
"To begin with, I'm obstinate and don't mean to be beaten by a bit of greasy rock.

Then I expect I'm heavier than you think." "You're ridiculously proud.