Current flows during lightning despite the path not being completely closed, as the discharge occurs rapidly between charged clouds and the ground. Lightning lasts only until the surrounding area is discharged, which is why it appears to die out quickly. To observe current flow during a lightning strike, one can use a lightning rod, which captures the high electric current generated. The discussion highlights the difference between electronic circuits and natural phenomena like lightning, emphasizing the unique behavior of charges in such events. Overall, the complexities of lightning and current flow challenge conventional circuit theories.