そりゃ結石を砕く威力の衝撃波ですから、焦点から多少分散したところで結構なパワーがありますわね。
ホントに破れるかと思いました。

These were shock waves with the force to shatter the calculus, so they were pretty powerful from the focal point to where they dispersed somewhat. I thought I really was going to get torn apart.