Combustion happens when the planets are too close to the sun and they loose their impact in the astrology chart.
The 8th House for Pisces Ascendant is Libra Zodiac (Ruled by Venus).
For the combination mentioned, the following can be stated
- Mars is energy & will power while Mercury is intellect & management. The combustion will lead to the person finding it hard to manage these aspects of life
- Sun is debilitated in Libra. Considering this, the person will find it hard to stand up for themselves in the early part of their life or manage their time and diet
- With a debilitated sun, the focus moves to Saturn. Wherever it is placed, the person should focus on it and houses ruled by it
Hope this helps
God Bless!
Lateral Thinking 
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