Yes, you can spell reflect anti-magic shields. However, it doesn't affect us. Here's why:
1. If we reflect the first shield, we've already got a raid-wide damage reduction until next shield.
2. If we reflect a shield that pops up immediately following the on we're in, it doesn't matter because we're skipping that shield anyway. We stop reflects a few seconds later so we don't reflect a second.
3. If we reflect the second shield, we simply run over to the previous shield instead. It's small, but it'll last long enough.