Meh, whenever these rondelguys bug me I just grab a bigass axe and then watch them flee when im busting their shields into pieces. Going against a rondel shielder is rather easy when you are a shielder 2, only with a axe. Then its just patiently spamming attack till their shield breaks. I never have issues with ruining a rondelusing players day. But I can clearly see how hard it must be when you are going against it as a archer or 2h.