Oswall's recollection did bring up some points of interest for Meesei. Based on Vera's explanation Jerrick's waterskin was open to be poisoned during training in the main chamber, and when he left it in the meeting room. According to Vera, she believed that Darahil had stepped away with Jerrick to the overlook of the dining chamber, and according to Oswall, Darahil was away all morning. That would mean he was not present for both poisoning opportunities. However, Meesei was not drawing any conclusions until she had heard everyone's recollection. Once she had everyone's story, and learned more about the poison from Sabine, she could start cross-examining each of their testimonies. She could already think of some more question she needed to ask Vera, but for the moment, Meesei simply finished her notes and moved on to her next question. 

"Thank you. I believe I have just one more question for the moment. We know the vector through which Jerrick was poisoned, his waterskin. In order for the poisoning to go unnoticed, he would had to have been separated from it at some point. Try to think back, were there any points during the day you can think of where he was not carrying it on his person?" Meesei asked.