Ridiculous if you think a downward header from 6 yards is realistically savable. Have you played the game before? The crime is a forward having a free header that close to goal. Who was marking?
I am not sure how you can blame Handa for that... a free header from that range, there is little a gk can do than make himself big and hope for the best... that's what he did.
Our defense, who left a man completely unmarked to just walk in and head, that is abysmal.