a hydrolic line was apparently hit by one of the bullets, as depicted in this drawing: https://nitter.poast.org/pic/orig/media%2FGSo2H41XEAAqNxg.jpg

Edit: Here's a video from John Cullen showing an alternative position for the first shot, which corresponds better to the facts so far ( at 40 secs ): https://video.twimg.com/ext_tw_video/1813567892958412800/pu/vid/avc1/1280x720/8slE3gy5yW7EtIYk.mp4?tag=12

a hydrolic line was apparently hit by one of the bullets, as depicted in this drawing: https://nitter.poast.org/pic/orig/media%2FGSo2H41XEAAqNxg.jpg