He had never measured a footprint in his life, and what he did not know about bloodstains would have filled a library.
The protagonist is portrayed as someone entirely inexperienced in the fields of tracking and forensic investigation. The quote suggests his lack of skills in measuring footprints or analyzing bloodstains, highlighting both his ignorance and naivety. This sets the tone for a humorous exploration of a character who finds himself in unexpected situations without the necessary knowledge or expertise.
P.G. Wodehouse's writing often features characters who are out of their depth, leading to comedic misadventures. Here, the mention of footprints and bloodstains emphasizes the ridiculousness of the protagonist's situation. Rather than being an expert, he is depicted as someone unprepared for the challenges he faces, which is a common theme in Wodehouse's stories that delight in the absurdity of human folly.