PVP - Opponent selecting monster

hello
in PVP, is this a bug when opponent selecting monster the game freeze or my opponent is just being a jerk not selecting next monster? isn't it possible to make a countdown too when selecting next monster to fight?

It's most likely a lag in the game. Keep in mind you may be fighting people half way around the world, there're going to be connection issues

The countdown idea has been suggested by a few people and I am for it as well.

As Lord.Rex said, it might just be a connection issue. Usually when this happens to me, the person who lags usually get disconnected. However, do keep in mind that some people just forget about the game as well when something urgent comes up.