You are not 100% safe...don't sit down or start dancing, there's probably someone with a freshly charged super heading your way. I myself have golden gunned dancing and sitting Titans before...just last night i caught one dancing in his bubble
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If I'm in my bubble capping a control point then I can't do anything about golden gun, FoH, or Nova Bomb. I can scramble a little, but my best option is to make you waste your super bringing down my bubble and getting 1 kill while I cap the point. So sit, stand, dance, whatever. Same outcome. I will say I do typically walk out the back when I know a super is coming because the shield can often eat a FoH/NB without killing you behind it.