Hamilton had gained the advantage of momentum by cutting the corner, he was suppose to back off to lose that advantage and he didnt nor did he give kimi back the place easily, kimi had to work his way past him, if you have the race on hdd you can see that kimi has to acclerate aggressively to catch up to lewis and lays a lot of rubber down on the track..., If he didnt have the momentum he couldn't have overtaken kimi so easily there, he wasnt in the slipstream for even a second... If he just backed off then he could have easily overtaken kimi later because his car was better in the wet..