You barred one of the best schools of magic, the first one to get SoD effects? Wow! Enchantment is right up there with Illusion and Conjuration!<br/><br/>Anyway, not to continue being a pest, but Summon Monster spells have a 1-round casting time. Which means the Bison appears and attacks on the<em>following</em>round. Assuming the Tendriculos doesn't OM NOM NOM NOM on the caster first.