The Orioles are halfway through their series in Toronto and the roster underwent a few changes since the conclusion of the last homestand.

Tweaking the bullpen was expected. The question was which reliever would be recalled and which would be optioned or designated for assignment. Something had to be done to inject a fresher arm.

A freak accident on the on-deck circle forced the other move.

Here are three questions, raised like fingerprints after Monday’s announcements.

How long will Connor Norby stay with the Orioles?

Ahead of their series- and homestand-opening game with the Boston Red Sox this afternoon, the Orioles have activated right-handed pitcher Thyago Vieira and optioned lefty Nick Vespi back to Triple-A Norfolk.

On Saturday afternoon the O's sent Triple-A pitcher Garrett Stallings to the Milwaukee Brewers and acquired right-handers Vieira and minor leaguer Aneuris Rodriguez. Rodriguez is heading down to the Florida Complex League while Vieira now joins the big club and will wear No. 40.

Vieira, 31, had a 5.64 ERA, 1.701 WHIP and one save in 16 appearances with the Brewers. He owns a career 6.18 ERA and 1.667 WHIP in 41 games with the Mariners, White Sox and Brewers since making his major league debut in 2017. He pitched in Japan from 2020-22.

Vieira throws some high-octane fastballs, with a two-seam sinker that averages 96.9 mph and a four-seamer at 97.7 mph. He’s averaging 4.9 walks per nine innings in the majors to go with nine strikeouts. He’s averaged 4.5 walks in 10 minor league seasons.

The Brewers designated Vieira for assignment on Monday. He’s out of options.

The bullpen is about to undergo another change.

This one comes from outside the organization.

The Orioles traded Triple-A Norfolk pitcher Garrett Stallings to the Brewers this afternoon for right-handers Thyago Vieira and Aneuris Rodriguez. Vieria hasn’t reported, and the 40-man roster will be full upon his arrival. Rodriguez will head down to the Florida Complex League.

Vieira, 31, had a 5.64 ERA, 1.701 WHIP and one save in 16 appearances with the Brewers. He owns a career 6.18 ERA and 1.667 WHIP in 41 games with the Mariners, White Sox and Brewers, making his major league debut in 2017. He pitched in Japan from 2020-22.

The fastball averaged 98 mph this season and his sinker has plus velocity at 96.9, but he’s averaging 4.9 walks per nine innings in the majors to go with nine strikeouts. He’s averaged 4.5 walks in 10 minor league seasons.