Why is Helmholtz capable of more intimacy with the Savage than Bernard

Helmholtz was open and interested. People were drawn in by his warmth.

Helmholtz and the Savage took to one another at once. So cordially indeed that Bernard felt a sharp pang of jealousy. In all these weeks he had never come to so close an intimacy with the Savage as Helmholtz immediately achieved. Watching them, listening to their talk, he found himself sometimes resentfully wishing that he had never brought them together. He was ashamed of his jealousy and alternately made efforts of will and took soma to keep himself from feeling it. But the efforts were not very successful; and between the soma-holidays there were, of necessity, intervals. The odious sentiment kept on returning.