While Wesker notices the strange portal underneath them, he can't move out of the way to prevent the drop. What he can do, however, is to quickly shift his hold on Tony to not snap the man's neck with the sudden motion and impact. So between the portal opening and landing somewhere else, Wesker quickly moves Tony's body to hang safely over his shoulder instead and holding him there as he drops back on his feet, now glaring at the turtle instead.

"I can ask the same." He growls. "If BOTH of you just did what I said, your brother would already be awake again." It's really no wonder that these people just kept getting into these sort of predicaments. No one pauses to take a moment and just think rationally.