u/Free-Switch-9871

If lucinia was the test subject for Dr Sheridan and tari is the product of that experiment, how do they both exist physically at the same time. I haven't watched meta runner in a while, but remember that at one point lucinia was shown physically while tari was also somewhere. How do they both exist? Did tari just appear in the same way that theo manifested? I haven't seen meta runner in a while so might misremember some things, but this confuses me.