Forum:Summon negated

My opponent had 1 face down and 2 monsters he used t synchro summon Shien I used Solemn Judgement and he activated Musakani Matagama is that a legal move. I am confused as to how summon negations work do you actually back pedal to immidatly before the monster is on the field or do you just consider that one card not on the field or is it already on the field I ran into the same problem try to solemn a Jinzo.

Shinkirou 18:30, December 31, 2011 (UTC)