Glad dad knows he can still trust Rose to keep Benika safe
They had the talk back in the restaurant before + she protected him then so he knows she's trustworthy/genuine in her feelings.
Father being clever enough to figure everything out and being decisive enough to get the rosary to the safest place and trying to stab one of the hitmen, wow I am impressed, best father.
Honestly the mixture of his correct and wrong assessment leading to this action is pretty interesting.
He's correct on the two's aim - the rosary (well, Gina KNOW it's the rosary, but Hibai should be able to piece it together right away)
On that letting the other side act first would be bad (though only because it'd be the archbishop's new rigged rosary killing everyone)
Though he's wrong on how strong they are which lead into the ending page (both of them are weaker, thus choosing to take him hostage)
Also those two are locking
hands forks behind him on the last page.