Sims joined the Dragons on Wednesday and was immediately thrown into the deep end when coach Paul McGregor named him on the bench in the Dragons' eventual 10-point win over the Storm on Saturday evening.
Sims was mobbed by the media after his first Dragons showing and didn't beat around the bush when NRL.com asked him about his Knights departure.
"You know me, mate. I love Newcastle. I love the place and the people that are involved with the club," Sims said.
"But the club opted to go in a different direction. Things changed and they changed quickly.