Torches (and Frogspawn) are nasty, nasty murder biscuits!
I had some Indo torches kill an Aussie torch, three hammers (frag rack was a bit too close to the torch garden), zoas... You name it. One of my frogspawn killed 2 colonies of zoas.
If they can reach it, they will kill it.
I will add that I have a garden with 7 different Indo torches peacefully coexisting, mingling tentacles, etc. I just give the garden a wide berth when placing other coral around it. My hammers and frogs are mixed without any issues.