Let's say you can have a maximum of 4 spell levels siphoned at once and you are already full (for example you siphoned two 2nd-level spells). Can you still keep using the first paragraph and make creatures not able to cast the spell again but just can't siphon (add more to your prepared spells) anymore?
Spell Siphon from Warlock (Parasite Patron)
Let's say you can have a maximum of 4 spell levels siphoned at once and you are already full (for example you siphoned two 2nd-level spells). Can you still keep using the first paragraph and make creatures not able to cast the spell again but just can't siphon (add more to your prepared spells) anymore?