Answer:
From the information in the excerpt, one can conclude that Hall is certain that the growing outrage by the American public would help Britain's cause.
Explanation:
The above mentioned excerpt is a part of the novel 'The Dark Game' authored by Paul Janeczko, which is based on the true spy stories involved in the US and it also depicts the role played by the spies and intelligence during the Revolutionary war to the Cold war.
From the excerpt, we get to know about the tension arising in the mind of Hall and we can conclude that Hall is very well aware about the fact that the growing rage among the American public will do them no good and will only lead to fulfilling the cause of Britain.
The Cyclops's effort to move the stone is compared to a simple task, showing his strength is corect