Luna Tuner is one of the strongest Raiders in the world, and it is not just empty words as she really is one of the strongest.
A normal S-rank raider can come out unscathed even if they are standing right in front of an exploding grenade. The stronger ones can do the same in larger explosions and Luna was in the stronger category.
But still, when the explosion below the stage was about to happen, her senses started tingling and she felt a premonition.
Just like any other Raider, she also trusted her senses as they always help in battle, so, listening to her senses she moved at the fastest speed she could and jumped off the stage, narrowly escaping the center of the blast.
However, she was still left perplexed, she was not confused about what was happening, she was not dumb enough to not understand that, she was confused as to why it was happening.