It's not an unfair advantage when there are other ways to go up. If the lava hasn't started yet, go some other route, if it has started, push them out of the way!
So it's okay to block existing paths because there are other paths that may or may not be covered in lava already due to random lava rising speeds, or the player is just a little slow.
Personally, I don't think players should be penalized unless their actions alone have created the situation they are now in.
And no, I'm not referring to afks or people who aren't defending themselves at the time, I'm talking about equally fighting each other, players should hold no more power than the other unless demonstrated through their own skill, and just that.
A player is impossible to move by any means for the victim, I call that unfair, and would even go as far as calling it abuse of the map itself in a way, it does not give the player a second chance at overcoming the aggressor.
A player abusing the way the map was built to his advantage, making him impossible to kill in a fight should be an offense the admins can enforce.
The same reason I am angry about here is the same reason that the teledoor with the sides to it was changed to just a teledoor on the wall, it was unfair, made certain players invincible to actions by others.
And what happens when more and more players start using these ways of keeping the players off the paths? It's allowed by the host and the admins will either be punished for it or told not to do anything about them, so why the forget not?
Players are essentially allowed to abuse this power, forcing other players to find other ways up.
Poll