A little while back.
As soon as Leon heard the roars of the dragon, he had quickly left the rest of the men and rushed towards the roof where he had left his mother and Levy. He had never moved that fast in his life and strained his body to its limit to get himself back there in the fastest time possible.
Arriving on the roof within a handful of seconds, he saw that Levy's chest was still moving up and down and was still breathing. Seeing that comforting view, his legs suddenly turned wobbly like jelly, and he sank to his knees and held onto Levy's hand wordlessly. It was a miracle that he was still alive, though barely. However, it was obvious to Leon that it was impossible to save him now. The glaive had pierced right through his heart and even Levy himself knew he was going to die soon. Though a vampire is strong, such a wound was fatal, nonetheless.
