I am about to participate in a first aid training workshop. Before I do so, I am supposed to pass an online first aid course. While going through the course, I came across this section about applying pressure to wounds in order to stop critical bleeding:
It is always necessary to find an appropriate compromise between safety and promptness.
For instance, you would probably not hesitate to put your fingers into e.g. the wound of your partner without any protection; It would be a more than brave action in the case of a stranger. On the other hand, the casualty may bleed to death before you manage to get a pair of gloves or a bandage.
If the casualty responds, you can ask him/her to press the bleeding wound, and you can enhance the pressure over his/her hand. Or you can use a piece of clothing, etc.
Is it really that dangerous? Why? What should I do if the "casualty" does not respond? How much and why is it risky to apply pressure myself?