In most cases, yes. A Servant has the right to refuse the call, but...hm, how to put it...?
[He pauses, tilting his head before nodding.]
A Normal summons is akin to someone politely coming up to your door and asking if you would do them a favor. Since most Heroic Spirits are stuck at the Throne, most leap at the chance to leave and be among the living once more. But one could say 'no thank you' and shut the door.
A Catalyst is much more like the police coming to your door with a request to come with them to the station. You can still refuse, of course - you have that right - but doing so may have consequences, such as not being called up again if people learn you're not keen to answer. Or being strongarmed into it regardless.
no subject
[He pauses, tilting his head before nodding.]
A Normal summons is akin to someone politely coming up to your door and asking if you would do them a favor. Since most Heroic Spirits are stuck at the Throne, most leap at the chance to leave and be among the living once more. But one could say 'no thank you' and shut the door.
A Catalyst is much more like the police coming to your door with a request to come with them to the station. You can still refuse, of course - you have that right - but doing so may have consequences, such as not being called up again if people learn you're not keen to answer. Or being strongarmed into it regardless.