When does right to private defence of body extend tocausing death?

Right to private defence of body up to causing death
Section 100 of BPC specifies six
situations in which the right of private defence of body extends even to causing death.
Section 100 - The right of private defence of the body extends under the
restrictions mentioned in section 99, to
the voluntary causing of death or of any
other harm to the assailant if the
offence which occasions the exercise of
the right be of any of the descriptions
here in after enumerated, namely -
First - such an assault as may
reasonably cause the apprehension that
death will otherwise be the consequence
of such assault.
Second - such an assault as may
reasonably cause the apprehension that
grievous hurt will otherwise be the
consequence of such assault.
Third - An assault with the intention of
committing rape.
Fourth - An assault with the intention of
gratifying unnatural lust.
Fifth - As assault with the intention of kidnapping or abducting.
Sixth - An assault with the intention of wrongfully confining a person under circumstances which may reasonably cause him to apprehend that he will be unable to have recourse to the public authorities for his release.
Even though this section authorizes a
person to cause death of another in certain situation, it is also subject to the same restrictions as given in section 99.
Thus, a person cannot apply more force than necessary and must contact the authorities if there is an opportunity.