A decent alternative would have been him just sitting there thinking intensely, all the same text flying around the screen, but with none of the stupid Minority Report hand movements.
I thought it was ok, tbh. It's a stylistic quirk of the show, it just wasn't that prominent in the previous episode. The 1st series was doing this all the time. The alternative would have been him just go "Aha! I know what it is!" out of the blue or just have the camera dwelling on him for 5 minutes while he went "hmmmmm." It's a dramatic way of showing him thinking.