1. You can throw a glass of water at a steel plate, and obviously it won't do anything, but water jets can cut through many inches of steel.
Light alloys can easily cut through hard steel with enough kinetic energy.
#BasicPhysics
Runway taxiing is totally different to a plane
Just wondering how many flying hours you have on heavy jets, maybe I am a mere novice with only 30 years, but light alloy wings do not cut through steel sorry, and it was not traveling at over 500kts