Something I've been wondering is if in the lore, can a guardian use any subclass ability at any time? For example, could a titan drop a bubble and then immediately throw a fire hammer? And again, I'm just talking about for story telling purposes.
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Yes there are several lore examples like osiris during season of the hunt, and I believe ikora did as well. Felwinter even did a shoulder charge despite being a warlock, so technically each class can learn each others moves.