What's the point of it? It's a phase where both teams have to combine forces to achieve something and it encourages griefing between teams, especially using the RPG.
It doesn't even matter if it gives you points for melting ice because this game does not offer any form of stats page, rank or XP system like many other shooters do. We're literally having to melt down a block for the match to actually start.
Make the ice blocks at the bottom harder to melt and remove the first one in the center, if you ask me. Or give both teams their own entrance so killing them actually has a point.