One of my players characters died (one shot not campaign) should I be scared.

I was hosting a one shot and near the end my players pc died. I just need to know if I should be scared that he will target me when he hosts a session and try and kill my character. If you want more context on the story, the bbeg almost pushed him into lava but he held onto the edge and he failed his save getting up. I decided to be nice and said if someone else reaches him and pulls him up he won’t discintergrate into lava. Someone made it there but half failed is strength check on pulling him up so even though he was pulled up he hit some lava and since he was low he had to roll death saves and failed. That’s how he died.