Thanks for the reply. I am ok with more difficultly in hitting leg. But if there was some indication that they were hit. Like for example if the hit a leg and it blocks, but does a little damage, but will not cause enough to caught off. Then if they are hit again in close proximity to that other hit, it does not block, but cuts off that location. You can extend this by using a jet pack to make it a one hit cut instead of two. You could have an area of effect on limb to show where to cut second, like a discoloration to show the damage and not a removal of blocks. The saw blades should just cut through. I watch the saws go through the same two legs over 7 times and there was no damage.
Viewing post in Spider-tron legs, screenshots
Primarily they are immune because they are designed to be a much tougher enemy than the regular combat bots. - Also, during testing it was found that by making Spidertrons immune to saw blades, performance was able to be kept in check in the later tiers of Endless Mode. - Hopefully Spidertrons will be a bit less "flighty" with the upcoming hotfix, thereby getting stuck less often in those very difficult positions; e.g. between the walls in the saw blade trap.
-Cheers