I guess, the next thing you're going to tell me is that weapons and armor get damaged in combat...There is also the chance that the rope would become frayed, ten feet isn't much, but you could mention that the rope is now damaged from the attempt.
Seriously, 4e doesn't care about this kind of stuff! I'd probably just handwave it, unless time was of the essence. Hanging on to a rope obviously doesn't require a check. Reasoning: _I_ can do that!
Pulling a pc up a rope _might_ require a STR check, but it should be an easy one if its within the carrying capacity of the character.
) Anyway, the PC in question, who was also a dwarf, was covered by a rat swarm and couldn't climb back up. She already had a rope on her and half the PCs in the party were up top, while the rest were scouting the perimeter of the house. The PCs holding the rope wanted to pull the dwarf up quickly, so I made it an athletics check medium DC, with their movement rate set by the weight of the character, her equipment and the rats. It took them a combat round to do it.