I think in retail a damage spell would push back the spell .5 seconds, but then it would be locked out for a second. This prevented chaining spells back to zero. On here there is no such mechanic. You can chain .5 into .5 into .5 and completely destroy a cast. The maximum a 1.5 sec cast should take to cast is 3 seconds (1-0.5+1-0.5+1 = 3 seconds). I've sat for almost 5 seconds casting a 1.5 second heal. That is ABSOLUTE bullshit, regardless of if I had 1 or 50 people on me. Not only do these problems gimp melee vs caster combat, it screws up caster vs caster combat when DoTs push back freaking casts. According to Wowwiki only these types cause spell pushback.