If I increase the threat of my natural weapon (improved crit) (19-20) does this affect my touch spell cast through it?
Pg 213: A touch spell that deals damage can score a critical hit just as a weapon can. A touch spell threatens a critical on a 20 and deals double damage.... pg 186:.... Alternatively, you can make a normal unarmed attack (or attack with a natural weapon)while hold the charge.....If the attack hits you deal normal damage for your unarmed attack or natural weapon and the spell discharges.
What does "score a critical hit just as a weapon can" mean? does this and "If the attack hits you deal normal damage" mean that the crit threat is changed?