They lost time by changing the tyres. Even though they changed the tyres, the weather got worse at the same time, so no fast could be made in such conditions. Massa was lucky...
I thought Hamilton and McLaren would have learnt not to take stupid strategy risks when you don't have anything to gain from it, it would make sense for a car lower on the grid to risk it on different tyres, but not a front running car. I wonder if we will see a second win for Kovalainen (I learnt how to spell his name!) if it's wet tomorrow.