I have drawn certain conclusions ”yes. Summerhaye was still looking rather sceptical, but Japp continued his scrutiny of Poirot. 
Summerhaye and Japp reacted differently to the situation.  
mnli hypothesis: Summerhaye and Japp reacted differently to the situation.   premise: I have drawn certain conclusions ”yes. Summerhaye was still looking rather sceptical, but Japp continued his scrutiny of Poirot. 