Red Card

The Red Card (レッドカード Reddo Kaado) is another algorithm, similar to the Blue Card, written by Shibumi that was intentionally made to alter the wavelengths of the digimon’s digital compostion (quantum information) to match that of the D-Reaper, enabling them to fight within it without suffering any effects. However, there was a key element missing in the card’s design, and Shibumi eventually realised that when writing the algorithm, he had neglected to take into account the nature the Human-Digimon hybrids, which would mean changing the complex wavelengths of the humans. Due to this, they reverted back to their respective Human and digimon forms.