Hey there,
Thank you for reaching out.
We understand you're experiencing lag with fast-moving enemies. We're sorry to hear of this, as we can imagine the impact this may have had. If you haven't already done so, you may wish to verify whether [url=https://help.bungie.net/hc/en-us/articles/360049024092-Optimizing-Connections-Improving-Latency-and-Packet-Loss]Optimizing Connections[/url] alleviates this lag.
If the lag persists, then please let us know if this is happening only in specific activities, and which specific enemies appear affected. We'll then review.