If the death is significant enough there's a chance you don't respawn. Its called a failed respawn. Some think its permadeath, but those who know better know its actually sudden ban due to error. It happens when there is too much going on to the player when the server tries to respawn them. For example, lots of extreme emotions, severe injury, poor mental state.
The first thing Phil realizes is the signs, he knows as Wilbur shoves a sword into his hands begging to be killed what will happen.
The second thing he realizes, as he looks at what Wilbur has done, the chaos and destruction happening below them, is that its probably Wilbur's only chance at healing.
[Wilbur Soot was slain by Philza]