Remote Mine + totem support = OP ?

Not sure if this is working as intended or not really.. firstly im confident in at least one bug with this combo.

so here's the deal i took a 4 link with
faster casting lvl 13
firestorm lvl 7
totem support lvl 2
remote mine lvl 2

and was killing everything on ledge quite handily on merciless

i was just messing around but figured this was pretty op as it's only a 4 link and with low lvl gems... pretty sure ice spear on a 6 link all lvl 20 gems would be rediculous

now for the bug, presumably anyways: once you lay your 5 traps, if you lay 6th, it destroys a previous trap. However, if you lay 5 traps, set them off, then lay additional traps and set them off, they stack and do not get rid of the old ones.

comments feedback etc... post it up