Clarence was naturally focused on the search for Mimring since he had no way of knowing Jason existed until he revealed himself.  When that moment came and a blackened dragon began to grow before him it naturally drew Clarence's eye – and his ire.  Clarence did not enjoy cat-and-mouse games such as they had been engaged in.  As glad as he was that his prey presented himself and proved he wasn't simply going paranoid – the moment Clarence saw a dragon appear he immediately attacked.  He converted nearly all of the heat within his Subversion Field into a fresh batch of Arctic Flames and pointed his staff in Jason's direction before slipping into Time Alter again.  

While all this was occurring Jason was roaring – the powerful roar might have failed to intimidate Clarence - but it did shatter much of brittle surfaces surrounding Jason currently under the effects of Arctic Flame.  This created a beautiful shower of ice and crystal particles in the air for a moment sparkling in the blue highlights of Clarence's magic as the Arctic Flames gathered at the tip of his staff while Jason roared.  A quick thrust of said staff as Time Alter's effects came to an end propelled the Arctic Flame forwards quickly and unerringly towards the target before Jason even had a chance to issue forth his flames.  

Even should Arctic Flame fail to reach Jason before his flames emerged; with the effects of the previous round of Arctic Flame still persisting it was unlikely that Jason's flames would be sufficient to block or even deflect the renewed attack on his person.  The lightning bolt which streaked away from Clarence was noted but for the moment disregarded as Clarence focused on amassing a new and intense batch of flames surrounding himself in preparation for his next move if it became necessary.  

The Blossom flail was aided greatly in its task of destroying the temple by Jason's roar.  The sounds of cracking in the ceiling began to grumble as the roof supports sustained damage past their midpoints.  Clarence made no effort to stop this slow decimation of the battlefield.