It would not be surprising that the damage is 20K + plate glass windows,
especially safety glass as that window appeared, can be really expensive.
«What to wear» checklist: — Wear
Safety Glasses or Face Shields, whichever suits better, to protect your eyes from harmful exposures like dust, chemicals, flying particles, smokes and what not -
especially if your job involves welding, cutting, grinding, nailing, concreting and chemical - related works.