Last night, I was kicked from a trial, but fortunately was able to stay in the instance without a removal timer, help defeat the final boss, and turn in the quest.
What I am used to is that being removed from a group removes me from an instance in 2 minutes, which happens in group dungeons as well as if people group and leave group in a delve. Have things changed so people can't deprive others of loot by kicking them from groups, or did I encounter a lucky glitch?