I still say that she could have just shot and destroyed the sketchbook, or shot and wounded Bellamy to grab the sketchbook while he bled, neither of which would have seen the female lead of the show kill her best friend, co-leader, and longtime partner who also happened to be the male lead.
Clarke arguably passed a point of no return when she shot Bellamy through the heart in last week’s episode.
It’s not surprising that Clarke would take desperate action to protect Madi at all cost, but taking aim at Bellamy and clearly shooting to kill felt unnecessarily extreme.