Now. Let’s evaluate the situation a little bit. From the looks of things, this black and white Stand was very strong. What made things even more interesting was the presence of a certain invisible man somewhere nearby. If he still had his factsphere visor, maybe he could pick out something or other. Dodge any attacks using Faster mode, pinpoint mister invisible’s location and kick his ass. As it stood he would have to take a different approach entirely. Sticking to Harder kinda sucked, but while he was in this mode he was indestructible.

[...]

Out of the shadows, the black and white Stand emerged with its palm open. Another worthless attack? A diversion like this might buy an attack of opportunity, but it wouldn’t do much more than hurt the attacker. It thrust an upturned palm directly towards his Stand’s face in a clear attempt to send his nasal bone upwards into his brain in what would normally be a one shot kill. As if that kind of impact could have any effect on him at all. West barely felt anything at all, so he flicked out a knife and walked forward. The boy didn’t flinch, though he did seem to be favouring a leg. Almost a shame, it meant this would be easy.

[...]

“Do you know how they killed their victims?” the boy asked. West’s head tilted away from the boy, from the gun and his sight fell upon his Stand. The answers came to him immediately, though they should have occurred much, much sooner. “Burke would sit upon their chest, and then he would smother them with a single hand. His thumb underneath the chin, the palm over the mouth and two fingers blocking the nose! They call this technique ‘burking’.”

Through water eyes and blurry vision, that was exactly what he could see; The black and white Stand was sitting on his own Stand’s chest, a single hand clamped to the bottom of the mouth while the other clutched the shoulder to keep it pinned down. The pressure it was applying wasn’t harmful in and of itself, but the fact was that grip was blocking the oxygen intake. Was it any wonder his body was in so much agony? He couldn’t breath! Not one single breath!
Several scenarios for escape flew through his mind immediately. There were two persistent problems. The first, the suffocation. The second, the boy with the gun. The first could be resolved by entering Stronger mode and powering his way out. However, the boy was staying out of arm’s reach. West would not be able to reach him or change modes in time to avoid the bullet. This problem could be dealt with by entering Faster, however - However, he would still be in the process of being suffocated. He would still feel this agony. He would still be trapped by this unrelenting pain. And with the way that grip was placed upon his face, it would surely crush the lower half of his skull. That kind of injury could be healed with Better, but not before the boy took advantage!

No matter how he cut it, he was doomed. Better was not sufficient to recover from this kind of injury, and a bullet to the brain was beyond anything they were willing to test. Unless he entered Stronger, he could not escape the grip. Unless he entered Faster, he could not dodge the boy’s bullet. No matter which mode he was in it didn’t seem to matter. He was trapped. One of these two, were they the criminal that Dio Brando meant? If so… If so, then whichever it was, they were a true mastermind. No wonder the Chancellor placed such personal concern against them.

-Lulu's Bizarre Rebellion Chapter 19