Final answer:
Milo is surprised that the others are so attached to Henrietta because he may have underestimated her or not realized her charm and appeal.
Step-by-step explanation:
Milo is surprised that the others are so attached to Henrietta because he may have underestimated her or not realized her charm and appeal. This surprise could also be due to Milo's own personal biases or lack of understanding of Henrietta's qualities. By being surprised, Milo's character development may be further explored or the story may highlight the unexpected nature of human relationships and connections.