The shield is not blocking knockback attacks like stomp or getting sent to orbit from phalanx shields.
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Hello there, Thank you for reaching out to us. We have received reports of players experiencing this issue impacting the Sentinel Shield super. As per our [url=https://help.bungie.net/hc/en-us/articles/39007140765204-Destiny-2-Known-Issues-and-Vital-Information]Known Issues[/url] page: [quote]Sentinel Shield can be pushed back while blocking by AOEs that create knockback. [/quote] For any updates on this issue, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News [/url]page.