On one of the days (εν μια των ημερων). Luke's favourite way of indicating time. It was the last day of the temple teaching (Tuesday). Luke 20:1-19Markus 11,27-12Matthäus 21,23-46

There came upon him (επεστησαν). Second aorist active indicative, ingressive aorist of εφιστημ, old and common verb, stood up against him, with the notion of sudden appearance. These leaders (cf. Luke 19:47