While also being new, I feel your pain on redundancy. However, sometimes too much is dangerous. Think of if something fails how it will fail. For example, it looks like you have the tag end of your tether tied into your primary and possibly secondary bridge... why this is bad, if your prusik fails for any reason and slips, now your tag end is all wrapped inside bridge and you’re trying to relive pressure on a taught line to transfer that weight to the backup prusik which is on your secondary bridge to untie that tag end from your bridge. I feel safer using an autblock or French prusik from my lineman’s loop attached to my tether, if for any reason my safeguard fails, my autblock will grab(I may be sideways but I’ll take sideways than 25’ down). If I can’t unfu*k myself then I will lower myself from my autoblok. if you want a secondary bridge in use then go ahead and continue using prusik how you are. This way if something fails you’re not suspended by a roped up tied tag end, stuck in the tree, while your legs are numb from sliding forward in your saddle trying to grab the tree for safety.
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