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Kazehito |
I suspect that you are getting terms confused between different game systems.
'break your own concentration' sounds like something from Pathfinder 1st edition or perhaps D&D 5e (I don't know 5e very well at all). In PF1 you could only have one active spell with a duration of 'concentration'.
Pathfinder 2e instead has the Sustain a Spell action (generalized recently to just Sustain to include sustaining things other than just spells) to handle the concept of keeping a spell going for as long as you can afford to pay attention to it.
Notably, you can keep multiple spells with a duration of 'Sustained' going. Witch characters do that quite regularly and even have the Cackle hex and Effortless Concentration feats to make that easier.
An action with the Concentrate trait doesn't interrupt anything else that you are doing. It just means that other things may interact with it - most notably, Reactive Strike (or Attack of Opportunity if using the slightly older term for it).
You are right. I'm coming from PF1E and D&D 5E, both of which used the fact that you can only have one spell/etc up with concentration at a time. I completely overlooked the difference here. Thank you for the help.