yeah but that's come in durability, not in Stamina. I am not saying I can survive the attacks if I deal with them head-on
well, FS only means you can see things a couple seconds before they happen, and infinite stamina means you wouldn't get tired out by running and dodging, but Attack Mastery, Reaction Speed (for attacks that don't require you to move your feet), and Movement Speed (for AoE attacks)--all have to come into consideration.
If you have +20 in CoO and +20 in Stamina, then unless you are using a technique that boosts your speed (which will have cool down times to take into consideration) or have a DF with a bonus to Speed Stats which lets you exceed the 100 stat cap, then you are going to have to creatively problem solve within your limitations if you are dealing with someone that has +20 in MA and/or technique or DF to boost into 120 speed stats.
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Basically you can't have 120 MA, 120 CoO, and 120 Stamina (from +20 shop item) all at once, so there are always going to be ways to respond--its up to you to RP it convincingly and in service to the narrative