How did wesker block the exit gate?

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So I was playing against wesker and exit gates were open and not blocked I was waiting for the last person who was injured and being chased and I took a hit for him and the wesker rammed me into the exit and the entity blocked it since I was being attacked and my teamate got out no problem and less then a second later when I tried to escape after being hit It was blocked.

After I was sacrificed and I checked his perks he didn't have blood warden or no way out or any exit blocking perks I read through them all. I just want to know what happened.

Also I have a screenshot of perks if anyone wants to see them.

Any answers are appreciated.

Thanks

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