Question

why did bannister walk to the end of the room and collaps into the chair next the window
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Answer 1

Answer:

The scratch on the desk was caused by Gilchrist's spiked jumping shoes as he grabbed them in his haste, and the clay blobs fell from his shoes. Bannister had collapsed in the chair to hide Gilchrist's gloves, which he saw had been left on the chair.

Explanation:

Answer 2

Answer:

When Soames had called Bannister upon the discovery of the moved papers, Bannister had collapsed into the chair to hide an object that would have revealed who had been present. Then when Soames had departed, Bannister had let the man who was hiding in Soames' bedroom out.