Board Thread:General Discussion/@comment-27907368-20160506131212/@comment-27907368-20160513234451

Chara's dialogue at the end of geno tells us that STATS did not wake them up, and that our presence alone was enough to wake them from death.

And again, it shatters because we are not true to Frisk's SOUL in neutral and the geno run. Once everyone has been befriended and their lives are on the line, Frisk awakens and re-fuses.

At the end of Geno, if you opt to bring the world back from the abyss, you must give Frisk's SOUL to Chara.

The heart does not refuse in the second phase. It doesn't even shatter. That is the ultimate power - the eternal SOUL. The complete awakening of Frisk, who is finally separated from their physical vessel.

There is DETERMINATION (re-fuse, seen w/ amalgamates and Undyne) and determination (seen with Flowey). Though the same element, it has different effects based on whether or not the being is in a physical state or is SOUL-bound. Like HP, DT is capitalized because it is tied to the SOUL.