Everyone was in shock. The xenogeneic officer was incredibly hard to deal with already, but now they had a real monster from the outside to contend with.
It wasn't a low-tier xenogeneic like the ones Han Sen had already dealt with before, either. The sanctuary door led to the Big Silence system. It was where the high-level xenogeneics resided. There were high-tier xenogeneics there, very much like the Dukes. If they entered, there'd be a grand disaster, just like what had occurred to the crystallizers.
Han Sen knew those creatures were somewhat restricted when they were in the sanctuary, and their strength would be limited by the parameters of the place. They'd end up like Old Cat and get flushed away.
Old Cat was a Nine-Life Cat, and it had authority in the sanctuary. There was no need for his power to be suppressed in the sanctuary, but the xenogeneics coming in would.