**There is an issue which causes swiftmend to change your cursor to the targeted casting mode (hand with blue outline) instead of simply giving an error message and leaving your cursor alone when you attempt to cast swiftmend on someone that has neither a Rejuvenation nor Regrowth HoT active on them at the time of attempted cast.**
This bug seems similar to the behavior when you cast on a dead target, or when you try to resurrect a player that is not dead in live, or when you try to cast on a target in a different phase (like in the Ultraxion encounter).
This bug also happens frequently on Australian latency (170) if I spam swiftmend right after I put a rejuvenation on the same target (I still am unable to use my swiftmend on the target whilst continuously spamming it even if rejuvenation is on the target as I have the targeted cast cursor).
Id like this to be either fixed or for an option to disable this. Also if there is any macro out there or addon to prevent this happening please do post about it (/cast !swiftmend does not work).