Getting skillchains interrupted is something that has been happening for a long time. SAM & BLU know exactly what I am talking about as they are the jobs that could self skillchain from the get-go. And even with communication as a BLU I was taught to put in a macro that would call out my self-skillchain, but I found certain people would hold their TP and wait for that moment to purposely interrupt the skillchain, or to "steal" my chain affinity, and rarely to continue a light or dark off my fusion at low levels, and double light/dark at higher levels. I like the idea of being able to stop others from skillchaining off of me or stopping my self skillchains. But Sadly I think that the way it is programed in (much like enmity) it would be to much work for the devs. Good idea though. For now however, communication is key if you want to skillchain and magic burst.