There is never really a good time to be ambushed by five dozen daemons, but 'while unable to call for aid' is a particularly bad time. If you weren't paying attention, you could call Griffie's party unlucky for it, but it's unsporting to call good planning on your opponent's part bad luck on your part.
The most pressing problem, namely the pixie bard Kenchlo, has been resolved. Other loose ends unfortunately cannot get the level of attention he did, but are still on track to being resolved, just more tediously. General combatants are focusing Devarre and Vinroot. Specialist thanadaemons are getting into position to address the numerous songbird-shaped problems which are at least conveniently grouped together and caged. The bibliodaemon team, in addition to targeting coordination, is also doing more direct informational cleanup, though the location they're currently after is annoyingly resistant. …and now it has a specialized ward. Reprioritizing.
Even for a strike as important as this, they can't actually deploy enough daemonpower to destroy all obstacles (and this time they're not even going for indiscriminate destruction, unfortunately), so it's not really a surprise that one of the obstacles is managing to cast a summon.