Holding on tight is fine; and it would be forgivable even if it weren't because Saturday wouldn't know. Puking on her, on the other hand...

Stacia refrains from yeeting Saturday into the bushes, but she does readjust her grip; trying to turn Saturday so that any puke coming out of her mouth will hopefully fall behind them instead of on either of them. She also stops zig-zagging so much, the people chasing them don't have guns so they should be fine to run straight into the trees until they have enough cover to slow down or stop.