of undetected negative leader from the projectile tail. The negative leader propagates in the direction of the positive leader from the grounded sphere. The positive leader ascending from the sphere interacts with the negative leader from the tail of the projectile until the entire gap between the sphere and the projectile is bridged. It is possible that the streamer zone of positive leader from the grounded sphere rapodly extends, via the projectile and its leaders, to the cloud, making the following process similar to probably, this is the reason why current of the positive leader ascending from the sphere tends to rise all the time until thequasireturn-strok process.