The speed of Arashi caught Akio off guard, by the time he saw the explosive tag it had already blown up. The explosion had sent him skidding backwards on his heels, he had raised his arms in front of him in order to protect his eyes from the shards of the explosion. Due to it catching him completely off-guard, he released his focus on Sage Mode and his chakra enhanced strength--leaving him completely vulnerable. If the teenagers played their cards right, they could easily get the bells and end this training exercise right now.