I have been noticing lately that in the arena, if the opposing team is also using Rotos the Lost Groom, if I attack their version with mine, the extra turn that mine is supposed to get for the A1 skill is being taken by their champ. I have seen this happen many times and I tried to capture it here in this video. You can see right at the end, when I kill thier rotos, the floating notification show the extra turn went to theirs, and not mine.