[Mithalwen]

I think that this incident is one of those wonderful moments where something essential to the plot is nevertheless completely in character for the person who does it. I think in the circumstances it was inevitable that Pippin would want to have a look, also that he was much more vulnerable to this temptation than Merry.

Pippin's style is to do first and think later if necessary, he chucks stones down wells just because there is a stone and a well and he is curious .. . This does not always casue harm - it is the same part of his nature that guides him to leave the traces that Aragorn will find.

Although in many ways they are a "pair" , Merry is more of a thinker, he does not rush in so much. He was the mastermind of the conspiracy, he thought to research their journey in Rivendell whereas Pippin clearly assumed there would always be someone to take care of him. For so much of the time he has been almost "going along for the ride", this is a crucial point for him, he has to grow up and separate from the older Merry who has been in a bit of an "older brother " role. When they meet again, it wil be Pippin who is in the protecting role.

This is also one of those interesting points when a "wrong" action is crucial.