After breakfast, I decided to go down to the village, and see if Poirot had returned yet; but, before I could start, a wellknown face blocked one of the windows, and the well-known voice said: "Bon jour, mon ami!"
The person had intentionally interrupted me not only to delay but to stop me from looking for Poirot. 
mnli hypothesis: The person had intentionally interrupted me not only to delay but to stop me from looking for Poirot.  premise: After breakfast, I decided to go down to the village, and see if Poirot had returned yet; but, before I could start, a wellknown face blocked one of the windows, and the well-known voice said: "Bon jour, mon ami!"