Jesus christ, your character literally clambers across the floor like a snake-bat. Unlike the Mech, who we can assume would bound over obstacles because it runs around on two legs, your character has shown to clamber over them and slither around, while doing so it alerted Higan, that's all there is to it. Not to mention, your character gained huge ground on Higan despite him running at full speed, so it's not as if he could have been keeping up. If I was trying to exploit the pauldron in the way you're describing I'd have argued you couldn't avoid the chain-gun because of it, I wouldn't have used it to set up my characters next move as he improvised his way through blindness. There's no reason to assume that Slimy would suddenly start leaping and jumping over obstacles when it would be quicker to clamber over them, especially considering the context it was in, which is why you failing to mention a different form of movement works in my favour.

An analogy then, my character sets up a raised pit-fall trap, the opponent runs over the ground. In my next post I say the pitfall activates, in their next post they say actually their character jumped over the entire trap because why wouldn't they, it's a minor inconvenience so it makes sense to just leap over it like a salmon when running would be quicker. You're saying it's impossible to refute that? There's no mention of Slimy leaping anywhere, only lunging and throwing its weight around, which would suggest a rolling motion if anything. Just because the obstacle is there and Slimy has the capacity to deal with it doesn't mean Slimy is going to deal with it perfectly, particularly if you don't even bother mentioning it.