This has multiple scenarios not featured in prior threads (example: none of the older threads showed Walter as a teenager, which is his "prime," essentially - aside from Millennium). Just wanted to point that out.
Location: War torn London.
Condition: To the death.
Normal morals. In round 4, Walter has the same mindset that he did when he fought Alucard.
Round 1. Walter (during WW II) vs pre-Nail Anderson
Round 2. Walter (aged) vs pre-Nail Anderson
Round 3/ Walter (Millennium) vs pre-Nail Anderson
Round 4. Walter (Millennium) vs Helena's Nail Anderson