Pain
Whenever I use Memory Drain on someone, I place my hands on their heads to connect my nerves to theirs. When I did the same for Jared, I felt a strange sensation that made me realize something was off.
Quickly, in reflex, I removed my hands from his head. But, before my actions could be completed, my mind got absorbed into this strange mindscape.
In Blank Canvas, my body's reflex action continued, even without my mind, so within some moments my hands would inevitably be removed from Jared's head. Once that happened, my mind would return to my body.
The problem was that with Memory Drain, everything seemed to happen within a moment in the physical world, however, a lot of information was processed within the mindscape. This means that a lot of time passes the mindscape before even a fraction of a moment goes by in the physical plane.