https://www.hcobb.com/tft/house_rules.html#Spells
Please note that the spells listed in the "Wizard Spell Reference Booklet" are a subset of the ITL spell list and with different descriptions. The two lists are not interchangeable.
Note for example
https://www.hcobb.com/tft/house_rules.html#iq14spells
Spell Shield stops only the staff's occult strike, it doesn't prevent using a wizard's staff as a two handed maul (or whatever it's physical form is) to strike the protected figure. However a wand staff would do no damage in this case.
Compare with The Fantasy Trip Wizard Spell Reference Booklet page 5
Does not protect against ordinary physical force, including damage done by created beings or things, damage done by weapons (ordinary, magical, or staffs),
Lastly the occult zap works like a Special spell and so never strikes the wrong target and can be used against certain targets that aren't damaged by even magical weapons.