Undertale reacts to Dusttale Sans fight by FDY

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Credits
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Phase 1-2    • Dusttale Murder Sans Fight by FDY pha...  
Phase 3 (Before Final atk)
   • Dusttale by FDY Sans Fight phase 3 fu...  
Phase 3 (Final atk)
   • Dusttale Murder Sans Fight by FDY (HP...  
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Difference from canonical story are possible
It`s only my view of their lives after getting to the surface
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