Kalista's W proc + targons allows the support to farm for the carry.

I don't know if this is a bug, but I was playing Leona the other night and noticed something odd. If Kalista autos a minion and leaves the target mark for a support with targon, the support can execute the minion (provided that the minion's health is in rage for the passive to activate) without using up a stack. Kalista receives the gold. The support does not receive gold nor does the adc receive health. Still, it makes it difficult for the support to use up a stack and allows Kalista to poke enemy champions while the support kills minions for her.