Just imagine this:
You are an elite navy soldier, proven yourself in many battles, maybe even in the New World. Your strength and speed is low level superhuman, far stronger than regular humans even dream of becoming. Maybe you even show enough potential that your officers started training you in Haki or Rokushiki. Anyway, you are among the 100.000 best of the Navy, chosen to fight in a war against one of the World Governments greatest enemies. Your skill and speed have so far kept you unharmed in this monumental battle. You are rather close to Whitebeard himself. A truly frightening foe, several times a normal humans size, unbelievable strength and one of the most powerful devil fruits of all. In a world, with Giants, Hybrids, Fishman, mink & So many unknown types of people, and among them he's holding the title "THE STRONGEST MAN IN THE WORLD"; A walking, living legend. But he is old, sick and injured. Sengoku gives the order to finish him. This is the chance to prove yourself! You and your comrades have stood against unbearable odds before! Together you can surely beat the monster! Together you charge at him. Some of you stab Whitebeard, one fires a bazooka directly into his face. He starts to fall! Then, suddenly he straightens back up. His voice like an angry roaring thunder as he reminds you who he is. He takes one big swing with his giant blade. Doesn't even use his feared devil fruit ability, just the strength of his arm. A gust of wind, a huge shockwave rips your body from the ground. There is dust and rubble everywhere, you can't see anything, you just feel that you have absolutely no control over your body anymore. The dust clears and you realize that you are suddenly hundreds of meters above the ground, falling to certain death.
How frightening that must be.