Scary glitch in game

[No]

So I was playing one of the rescue missions to levle up the fire sourcer when I was doing really good so good I decided to stay until I got 30 bravestones and right when I had 29 a reaper spawned except this one was indestructible the moment I realized that I rushed to complete the objective one suddenly reapers exponentially spawned and killed me
photos.app.goo.gl/L4mw7d2DHUnxvx35A