In the paragraph, the irony lies in the juxtaposition of the characters' situations and their emotional states. Sam expresses frustration or concern that implies something isn’t quite right, as suggested by the phrase "finally Sam has had enough." Meanwhile, Miles's response suggests that he is also in a similar state of emotional distress, evidenced by the phrase "so am I."
The irony is deepened by the fact that both characters are physically distant from each other, as indicated by "miles away on the other side of the lake," yet they are experiencing parallel emotions. This can highlight themes of isolation and connection, where physical distance does not equate to emotional distance, or vice versa. The irony serves to illustrate how often people may be going through similar struggles without realizing they are not alone, effectively conveying a sense of shared human experience amidst separation.