*deep breath*

1) Hydealyn's Blessing =/= our innate combat prowess. Middy taking or sealing the Blessing doesn't change the fact that we're very seasoned in combat at this point in the story. A handful of Brass Blades and/or Crystal Braves should pose zero threat with or without the Blessing.

2) Even if we're unarmed we should be far from helpless, especially monks. Lorewise you don't really need a weapon to use any of your abilities, including spells (it's difficult to control magic without a focus, not impossible). Monk's lore is all about training your body into a living weapon and channeling Chakra to do the impossible. Metal armor wouldn't be much of a deterrent for a barehanded monk (the Brass Blades wear chainmail anyway, not plate armor). Gameplay mechanics are the only reason you can't do any of this normally.

3) Fighting through even a medium-sized force of Brass Blades and Crystal Braves wouldn't have been an impossible feat for the Warrior of Light. So far as the lore and the story is concerned, the Warrior of Light even on their own is worth a small army in terms of ability. Fighting Primals, Garleans, Ascians, and even Dragons (not to mention all of the other horrible things we've had to fight) and emerging relatively unscathed each time helps to illustrate how strong we are. Even in instances where we had "help", we're still clearly many times stronger than the majority of the other characters, especially in comparison to normal soldiers. We might could get overwhelmed by a large enough force, but the paltry number of aggressors shown in the cutscenes probably wouldn't have even counted as a warm-up when compared to everything else we've fought up to this point.

4) Self-defense isn't the same thing as going on a murderous rampage with wanton abandon. You're being accused of doing something that's an obvious set-up. Teledji clearly intends to take you and your friends by force. You're screwed. A rational person who's familiar with Teledji's nature and sees that they're being framed wouldn't immediately roll over or cooperate in the slightest, they would defend themselves and evade capture until they could figure out what was going on (you know, like Thancred did). Fighting back doesn't even mean Teledji would have to be harmed or killed. You could have one-hit-quit the Brass Blades accompanying him and there's not a damn thing he could have done about it. They're trying to frame you anyway so in the grand scheme of things it doesn't really matter if you make a mess on your way out.

Bonus: Even accounting for mechanics, it's not unusual that we can still face and defeat the Primals just fine. Midgardsomr took Hydealyn's Blessing, not The Echo. The Echo is what makes you immune to being tempered.

*gasps for air*