I think Roglic and Carthy probably took a little bit of gass off in teh few minutes before the bike switch. Carapaz was gaining time for a minute there.Yeah, it was quite a bit more engaging than the usual imo and the jarring split made it a bit more tense (who was going to smash the finale vs fail)
I think he probably just went a bit too deep on the flat, might have flown up the climb on another day but traded +30s going into it. Always hard to know the right plan when there's more calculations than just distance