Haha yeah if it happens during the marathon I just run through it. Jumping & landing can then break your flow and the blisters can be dealt with afterwards!

During training I try to avoid it as best as I can without slowing down. Sometimes you can go around it, sometimes jumping over it and sometmes tough luck haha.
I expect tomorrow to be tough luck as I will be running in the dark so won’t be able to see them before it is probably too late.