Brontors did some strange things when i fought them before : if it`s burrowed Spikes work vs every melee unit attacking them. If they are above ground they will retaliate 1 time vs melee with no spikes, but if any other unit attack them during that turn and since thay already retaliated spikes will trigger and hit unit that attacked them. Try it out, maybe I just had weird situation. But as it goes from what i saw, spikes work every time brontors cant retaliate - borrowed , or already retaliated in current turn against some melee attacker.
Also i read somewhere on forum that brontors can retaliate against their own ally or enemy units if pet dragons rage skill lightning ball attack them, while burrowed and some unit is on hex near them. This is a bit tricky to replay, but it`s possible bug, i`m not sure.
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