That’s a neat itch to scratch. Lock the frames in a read‑only buffer and run a quick hash check every cycle—if the hash changes, reset the loop. Keep the raw sprite data in a compressed block that’s digitally signed, so any tweak to the dialogue bubble will throw a signature error and the scene will jump back to the original. For the hologram effect, render the 8‑bit frames into a 32‑bit surface with a fixed palette, then overlay a thin glow that doesn’t alter the underlying pixels. That way the look stays pixel‑perfect, the loop is tight, and any modders who try to edit the bubble get a clean break back to the authentic frame. Give it a test run and tweak the checksum interval until the loop feels both smooth and unbreakable.