I do not think ”Poirot watched him narrowly ”"that you quite realize the unfavourable nature of your evidence at the inquest. 
Poirot was ready to take action against any movements of him.
mnli hypothesis: Poirot was ready to take action against any movements of him. premise: I do not think ”Poirot watched him narrowly ”"that you quite realize the unfavourable nature of your evidence at the inquest. 