If you hold down on the D-pad to lay down and have Toadmin attacking you, you will not take any damage. If pikmin are carrying you, you will be carried back to the onions while the Toadmin are still attacking you. Once you get to the onions,you will hit the bottom of it and all the Toadmin on you will instanly die. It is recommended that this is not attempted, since the loss of Toadmin also counts toward your total Pikmin count.