Spellstrike isn't granting an extra attack, the touch spell does that. Spellstrike just changes what you make the attack with. The problem is target rules for touch spells don't make any sense. You decide the target when the spell comes into effect, except with touch spells that can be...
ComponentsV, S, M (a drop of sweat) EFFECT Rangetouch Targetcreature touched Duration1 round/level Saving ThrowFortitudenegates;Spell Resistanceyes DESCRIPTION You channel negative energy through your touch,fatiguingthe target. You must succeed on a touch attack to strike a target. The subject is...
This spell’s effect may make it impossible for the target to cast some or all of its spells, if the requisiteability scoredrops below the minimum required to cast spells of that level. Back toMain Page→3.5e Open Game Content→System Reference Document→Spells ...