He did absolutely the right thing in heading it down, just could have done with him bouncing it a bit closer to the goal as the ball bounced up to a nice height for the goalie to save.
From memory Areola made 2 excellent saves and another couple of decent ones, so we must have had some good chances. Their Xg would have been boosted by the first goal which must have been an Xg of .99 ie couldn't really miss!