2 added 331 characters in body
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It's a trap designed to move the plot forward. 

DM of the Rings CXIII DM of the Rings CXIII

Source: DM of the Rings CXIII

Out-of-universe: The intention is to get the heroes out of the underground chamber without any clarification on whether the Dead Men intend to help or not, in order to maintain some tiny amount of suspense (since the order of events was completely changed from the books and they weren't sure what they were going to cut out).

It's a trap designed to move the plot forward.

DM of the Rings CXIII DM of the Rings CXIII

Source: DM of the Rings CXIII

It's a trap designed to move the plot forward. 

DM of the Rings CXIII DM of the Rings CXIII

Source: DM of the Rings CXIII

Out-of-universe: The intention is to get the heroes out of the underground chamber without any clarification on whether the Dead Men intend to help or not, in order to maintain some tiny amount of suspense (since the order of events was completely changed from the books and they weren't sure what they were going to cut out).

1
source | link

It's a trap designed to move the plot forward.

DM of the Rings CXIII DM of the Rings CXIII

Source: DM of the Rings CXIII