Combos won't break from add to add unless you're slow to hit them, but if they are weak adds, I stick to the full thrust combo, since I can't get full dot benefit. Once I return to the boss, I restart with the chaos thrust combo to get debuff and dots going again. If it's a short mechanic stop and botd isn't close to being off CD, hopefully you can get the 4th combo in to refresh the botd timer and not lose it when you can go back to hitting it. Long stop? Burn botd with geirskogul and start rotation from the beginning again. (assuming 60)