We later discover that all Earthforce personnel's Comlinks are genetically engineered to each specific user, so Garibaldi should not have been able to use another person's link to call Ivanova. (When Marcus later tried to use another person's link later to contact Security, it would not work for him.)
The explosion at the start of the episode is far back from the "front" of the station, plus with rotation, anything coming out would be flung outward, in addition to the force of the explosion itself. There is no way that anything - including a person - blown out from there would be visible from the Command Deck.