Death Grip should not be castable while jumping/falling and should have ...

...8-30 yards range in PvP instead of 0-30 yards
If you could follow @Gooyeth here and do
```Unit* target = GetExplTargetUnit();```
and then
```
                if (target->GetTypeId() == TYPEID_PLAYER)
                    if (caster->GetDistance(target) < 8.f)
                        return SPELL_FAILED_TOO_CLOSE;
```