You know, in some ways conducting is counter-intuitive. It's like winter driving in Finland - if you skid, the natural reaction is to fight with the wheel and jam on the brakes, which is the quickest way to get killed. What you have to do is let go, and the car will right itself. It's the same when an orchestra loses its ensemble. You have to resist the temptation to semaphore, and let the orchestra find its own way back to the pulse.