Ed has a breakdown
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Ed attempted to build a river for the duck to float down out of drainpipes balanced on rubber bricks and various items. His construction kept falling apart, or else the duck didn't make it all the way down. Eventually, Ed cut off the duck's head and buried it in two different sections of the garden, then appeared to deny that the duck had ever existed. He spent 97 minutes and 9 seconds on not completing the task.
(Written by Taskmaster Wiki contributors)